Republican Donald Trump says that Democratic front-runner Hillary Clinton is only doing well in the election because of her gender.

US politics used to influence Europe. Now we may be about to witness the opposite - the flow of political tricks from East to West

COMMENT: There has been some debate among New Zealand political commentators about whether a candidate like Donald Trump could emerge in New Zealand, writes Stephen Mills.

Don't look now, but Donald Trump has made moves in the past week that are, wait for it, actually quite smart.

Republican presidential candidate Donald Trump said Sunday that while he thinks he will win the delegates needed to get the GOP nomination, the system is still "rigged" and "corrupt.

It's Republican hopeful Ted Cruz who has team with a history of religious bigotry and attacks on Islam, writes Arnold R Isaacs.

One of the great ironies of the American political process in the 21st century is the Democratic Party superdelegate.

Continuing unforced errors bode poorly for the front-runner's hopes in a contested Republican convention

COMMENT: Surely Americans are today scratching their heads, or more likely pulling the hair out of them, when they consider who could possibly be leading them for the next four years.

COMMENT: You knew it was a bad night when Donald Trump turned down the cameras. No gloating press conference. No stream-of-consciousness rant.

With tensions having greatly escalated between the two Democratic presidential candidates, Bernie Sanders sat down with the Washington Post yesterday.

The question, as always with Trump, is how much he listens to anyone not named Donald J Trump.

COMMENT: The US President holds mankind's fate in his or her hands, which is why we all have a stake in this election, writes Paul Thomas.

Democrats turn on each other as Sanders lists Clinton's failures and she rubbishes his policy ideas.

The year's biggest, wildest show is finally coming to Broadway. The presidential primary is descending on New York.

Future of GOP frontrunner's campaign likely to hinge on how Trump reacts to second-place finish in Wisconsin.

COMMENT: By economically crushing Mexico, he'll force the Mexican government to build the wall - and once the wall is built - he'll ease back on some tariffs, writes Rachel Smalley.

The beliefs and associations of Senator Ted Cruz, and the negative impact of those beliefs on his possible Presidency, will soon have a much-deserved meeting with the daylight, writes Richard McLachlan.

None of the three remaining Republican presidential candidates would guarantee yesterday that they would support the eventual GOP nominee for president.

The arm grab that supposedly never happened just landed Donald Trump campaign manager Corey Lewandowski under arrest.

Bernie Sanders is preparing to ratchet up his attacks on Hillary Clinton ahead of a New York showdown.

Donald Trump swept to victory in yesterday's primaries but rival Ted Cruz showed some fight with a win in Utah that gave hope to establishment Republicans.

Ricahrd McLachlan asks, how would the foreign policy positions of Hillary and Bernie best address global jihad? Trump and Cruz have already made themselves clear.

Terror attacks continue in the West. Jennifer Rubin, who writes the Right Turn blog for the Washington Post, asks if it could get worse.

"It's a big, dumb thing that only gets more expensive over time," Oliver said. "It's like getting a pet walrus. You think it's stupid now - wait until you learn what a bucket of sea cucumbers costs. You've not prepared for that."

COMMENT: If the US Congress had not imposed a two-term limit on the presidency in 1947, Barack Obama would be a safe bet for a third term next November.

Democratic frontrunner Hillary Clinton and her allies have begun preparing a playbook to defeat Donald Trump in a general-election match-up.

Donald Trump has warned of riots if he is denied the party's presidential nomination and pulled the plug on a scheduled debate among candidates.

COMMENT: With presidential race and border crossings turned into lucrative TV, issues of office solve themselves, writes Jerry Flay.

COMMENT: Before Donald Trump revealed himself to his ecstatic believers at the Tampa Convention Centre in Florida on Tuesday, his terrible retinue stormed the stage.