In another tweet, Trump continued his campaign to discredit the investigation as based on leaks of information from political enemies aimed at undermining him.
The Post reported late Friday that U.S. intelligence officials had collected information that Russia's ambassador to the United States had told superiors that he had discussed campaign-related matters and policies important to Moscow last year with Jeff Sessions, then a senator who had endorsed Trump.
As he has before, Trump also reiterated on Twitter his view that Hillary Clinton's campaign should be under greater scrutiny, and he contended that his son Donald Trump Jr. "openly" disclosed emails concerning a meeting with a Russian lawyer during the campaign - even though Trump Jr. did so after The New York Times obtained the emails and was preparing to publish a report on them.
Sessions, who is now attorney general, had initially failed to disclose his meetings with Ambassador Sergey Kislyak during his confirmation process; when they were made public in news reports, he insisted he had met with Kislyak only in his capacity as a senator and had not discussed campaign issues.
But The Post reported that U.S. intelligence agencies intercepted communications that showed Kislyak indicated he had "substantive" discussions on matters including Trump's positions on Russia-related issues and prospects for U.S.-Russia relations in a Trump administration.
Trump has denounced what he has called illegal leaks in the ongoing FBI investigation into his campaign's contacts with Russian officials. U.S. intelligence agencies have said Moscow meddled in the campaign, stealing thousands of emails and other documents from Democratic Party officials and releasing them publicly to embarrass the Democratic presidential nominee, Clinton, and to assist Trump.
Trump has said repeatedly that he did not collude with Russian officials and called accounts of the meetings between his campaign and Russian operatives a partisan attack by Democrats to avenge their loss in the election. But he and some of his top aides have hired private criminal defence lawyers to deal with the probe.
In his tweet, Trump was referring to former FBI director James Comey, whom the president fired over his handling of the Russia probe. Comey later testified to Congress that he had felt pressure from Trump over the investigation and, after he was dismissed, released memos of his encounters with Trump to the media.
The public disclosures helped lead to a Mueller taking over the investigation. (Trump's tweet also refers to Amazon.com, the online retailer led by Jeffrey Bezos, who also owns The Post.)
A Justice Department spokeswoman declined to comment on what she called a "wholly uncorroborated intelligence intercept" and reiterated that Sessions had not discuss interference in the election. Trump has been angered that Sessions recused himself from the Russia probe. The president told the New York Times this week that he would not have named Sessions as attorney general if he had known he would do so.
In yet another tweet, Trump attacked the Times for reports that Islamic State leader Abu Bakr al-Baghdadi, whose death in a Russian airstrike had been speculated last month, is still alive, according to Pentagon officials. It is not clear why the president holds the Times responsible.
His tweets came a day after Sean Spicer resigned as press secretary in the wake of Trump's hiring of New York financier Anthony Scaramucci as his communications director. Sarah Huckabee Sanders was promoted to the press secretary role.
