May 10: Trump fired FBI Director James Comey on the recommendation of senior Justice Department officials as he was leading a counterintelligence investigation to determine whether associates of Trump may have coordinated with Russia to interfere with the US presidential election last year.
The firing sent Administration officials into a frenzy to explain the sudden ousting of Comey, with then-press secretary Sean Spicer ducking among the White House bushes after a night-time press briefing.
May 12: Trump tells NBC News that he was thinking of "this Russia thing with Trump" when he decided to fire Comey.
May 16: Trump revealed highly classified information to the Russian foreign minister and ambassador in a White House meeting, according to current and former US officials. Trump's disclosures jeopardised a critical source of intelligence on Isis after it was collected and tightly held by senior officials. The revelation rocked the Administration, which has sought for months to defuse concerns that Russia has actively sought to disrupt political and social stability in the United States.
May 23: In March, Trump asked Daniel Coats, director of national intelligence, and Admiral Michael Rogers, director of the National Security Agency, to help him push back against an FBI investigation into possible coordination between his campaign and the Russian Government and urged them to publicly deny the existence of any evidence of collusion during the 2016 election.
JUNE
June 12: Donald Trump jnr - the President's eldest son - seemed to confirm Comey's version of events on Fox News as he tried to emphasise the fact that his father did not directly order Comey to stop investigating Michael Flynn after Comey said Trump told him he "hoped" he would drop the FBI's investigation into the former national security adviser. "When he tells you to do something, guess what? There's no ambiguity in it, there's no, 'Hey, I'm hoping,' " he said.
June 13: Attorneys-general for the District of Columbia and Maryland sued Trump alleging that he violated anti-corruption clauses in the Constitution by accepting millions in payments and benefits from foreign governments since moving into the White House. The lawsuit, the first of its kind brought by government entities, centres on the fact that Trump chose to retain ownership of his company when he became president.
June 14: Attorney-General Jeff Sessions asked Congress to reverse laws protecting medical marijuana providers from prosecution of providing illicit drugs. Sessions cited a "historic drug epidemic" to justify a crackdown on medical marijuana despite the fact that opioids, not marijuana, are at the center of widespread deaths in the country.
June 15: The special counsel overseeing the investigation into Russia's role in the 2016 election, headed by Robert Muller, interviewed senior intelligence officials as part of a widening probe that now includes obstruction of justice, officials said. The probe includes a look at coordination between the Trump campaign and the Kremlin and possible financial crimes among Trump associates.
June 28: The Washington Post reported at least five of Trump's clubs displayed a fictitious copy of Time Magazine featuring Trump on the cover. The magazine asked the Trump organisation to take the displays down.
"Donald Trump: The 'Apprentice' is a television smash!" the big headline said. Above the Time nameplate, there was another headline in all caps: "TRUMP IS HITTING ON ALL FRONTS . . . EVEN TV!"
JULY
July 3: A day after defending his use of social media as befitting a "modern day" president, Trump posted on Twitter an old video clip of him performing in a WWE professional wrestling match, but with a CNN logo superimposed on the head of his opponent.
July 12: Emails showed Trump jnr welcomed the assistance of a "Russian government attorney" in an effort to derail the candidacy of Hillary Clinton, the clearest contradiction of the White House's denials it had sought or utilised assistance from the hostile foreign government. Trump jnr later released an email chain that showed how the offer progressed to a meeting at Trump Tower in New York. The meeting was also attended by Jared Kushner, the President's son-in-law, and then-campaign chairman Paul Manafort.
July 22: Sergey Kislyak, Russia's Ambassador to the United States, told his superiors in Moscow that he discussed campaign-related matters, including policy issues important to Moscow, with Jeff Sessions during the 2016 presidential race, contrary to public assertions by the embattled Attorney-General. The messages were intercepted by US spy agencies. Sessions initially failed to disclose his contacts with Kislyak and then said that the meetings were not about the Trump campaign.
July 22: Sean Spicer announced he was resigning in protest following the appointment of Anthony Scaramucci as White House communications director.
July 22: Scaramucci takes his post at the White House.
July 26: After promising throngs of Boy Scouts gathered at the group's National Scout Jamboree that he would not delve into politics, Trump went on a 35-minute rant dissing his rival Clinton, marvelled at the size of the crowd and warned the boys about the "fake media". He also told a rambling tale about a famous, now-deceased home builder that meandered from a Manhattan cocktail party to a yacht and then to places that the President would only allow the boys' imaginations to go.
July 27: Trump announced on Twitter that he will ban transgender people from serving in the military in any capacity, an abrupt reversal of an Obama Administration decision to allow them to serve openly and a potential end to the careers of thousands of active-duty troops. The decision halts a years-long process of advancing rights for lesbian, gay, bisexual and transgender people in the US military that began with the repeal of the "don't ask, don't tell" policy in 2010.
July 29: Senate Republicans and the Trump Administration suffered a dramatic failure in their bid to advance a scaled-back plan to overhaul the Affordable Care Act after the dissenting vote of Senator John McCain and two Republican colleagues. McCain, diagnosed with brain cancer the week before, delivered a stirring address calling for a bipartisan approach to overhauling the ACA while criticising the process that produced the current legislation.
July 29: Chief of Staff Reince Priebus is replaced with John Kelly, who ran the Department of Homeland Security.
July 30: In two tweets, Trump called MSNBC's Joe Scarborough "Psycho Joe" and said the hosts of the Morning Joe news show came to Mar-a-Lago - his private club in Palm Beach, Florida - three nights in a row around New Year's Eve in 2016 "and insisted on joining me". He claimed that Mika Brzezinski "was bleeding badly from a facelift" at the time. Trump received heat from lawmakers who saw the episode as another distraction.
AUGUST
Aug. 1: Following a profanity-laced tirade with a staff writer for the New Yorker, White House communications director Anthony Scaramucci is removed from his position, apparently at Kelly's request, after only 10 days on the job.
Aug. 1: Trump personally dictated on July 8 a statement in which Trump jnr said that he and the Russian lawyer had "primarily discussed a programme about the adoption of Russian children" when they met in June 2016, the Post reports. The statement, issued to the New York Times as it prepared an article, emphasised that the subject of the meeting was "not a campaign issue at the time".
Aug. 4: The Post obtained transcripts of two conversations Trump had with foreign leaders shortly after he took office: One with Mexican President Enrique Peña Nieto and another with Australian Prime Minister Malcolm Turnbull. In both calls, Trump grew at some times hostile. In an acknowledgment his campaign rhetoric to build a wall between Mexico and the United States might have backed him into a political corner, Trump told Peña Nieto: "You cannot say anymore that the United States is going to pay for the wall".
Aug. 9: Trump used his harshest language yet to warn North Korea that it will be "met with fire and fury and frankly power, the likes of which this world has never seen before," if it does not stop threatening the US with nuclear attacks. "North Korea best not make any more threats," Trump told reporters at his Bedminster, New Jersey, golf club, where he was on holiday.
Aug. 10: FBI agents raided the home of Trump's former campaign chairman Paul Manafort, arriving in the pre-dawn hours in late July and seizing documents and other materials related to the special counsel investigation of Russian meddling in the 2016 election.
Aug. 13: Heather Heyer is killed in Charlottesville and as many as 19 are wounded when a car rams into a group of counter-protesters during a white-supremacist rally. Police arrested the driver, an Ohio man who reportedly espoused racist and pro-Nazi sentiments. Trump did not immediately condemn hate groups, instead saying there was violence "on many sides".
Aug. 15: Trump condemned hate groups such as the Ku Klux Klan and neo-Nazis two days after he failed to specifically target such groups in attendance at the rally.
Aug. 16: Still reeling from bipartisan criticism that he was slow to condemn white supremacists in Charlottesville, Trump revived his declaration that "both sides" were to blame for deadly violence, abandoning his message from a day earlier that had emphasised the culpability of the groups that organised and participated in the event during a combative news conference at Trump Tower.
Aug. 17: The President disbanded his two major business councils after the chief executives of Under Armour and Intel joined Merck's Kenneth Frazier in ditching the American Manufacturing Council over Trump's initial remarks on Charlottesville (though not before attacking Frazier and Merck).
Saturday: Susan Bro, Heyer's mother, said she would not speak with Trump or forgive his comments that appeared to equate the culpability of violence between counter-protesters with hate groups.
Saturday, later in the day: Trump dismissed his embattled chief strategist, Stephen Bannon, an architect of his 2016 general-election victory, in a major White House shake-up.
Saturday, later still: The combative right-wing news outlet Breitbart announced Bannon rejoined the website as an executive chairman after he gave up his position to join the Administration. "The populist-nationalist movement got a lot stronger today," the company said in a release.
