Donald Trump

With national polls showing a tight race just six weeks out from Election Day, the Hofstra University fight offers one of the last chances for each to speak directly to the tens millions of voters who are expected to tune in.

For Clinton, a veteran debater, one of her biggest challenges will be both to provoke Trump and avoid being provoked by him, while delivering an earnest and candid performance.

The Texas senator fought Mr Trump in a bitter primary battle, marked by mud-slinging and personal insults.

Mr Cruz said he would fulfil his promise to vote for the Republican nominee and that electing Hillary Clinton would be "wholly unacceptable".

He drew ire at the Republican National Convention in July, when he was booed off stage for not endorsing Mr Trump.

Waving placards as they drove the red, open-top, double-decker past the Palace of Westminster and St. Paul's Cathedral, the campaigners urged the estimated 200,000 US citizens in Britain to register to vote in the election on November 8.

They stopped off at key American hotspots in the city, including the American School, the City of London financial hub and a popular Philly cheesesteak food truck in Spitalfields, East London.

"America is like the best idea the world ever came up with, but Donald Trump is potentially the worst idea that ever happened to America," he told CBS's Charlie Rose. "He could destroy it."

"America is not just a country," Bono continued in the interview that aired Tuesday on "This Morning." "America is an idea and that idea is bound up in justice and equality for all."

The philanthropist and activist, who was in New York for the meeting of the United National General Assembly, called Trump's rise to prominence within the GOP "really dangerous."

On Monday, Trump Jr. tweeted a graphic that likened Syrian refugees to Skittles, which swiftly triggered a wave of criticism.

"This image says it all. Let's end the politically correct agenda that doesn't put America first. #trump2016," he tweeted, with a graphic that said: "If I had a bowl of skittles and I told you just three would kill you. Would you take a handful? That's our Syrian refugee problem."

Find out all you need to know for the 2016 election on "The Daily DC" podcast

"There is so much to know and so much to learn and so much diplomacy and kindness and introspection that goes with that kind of job," Stewart told CNNMoney during a luncheon for Andrea Bocelli's foundation Sunday. "And it does not exist in the world of Donald Trump."

For Stewart, the stakes are high and the only choice is Hillary Clinton.

Mr Trump suggested Mrs Clinton's security detail should give up their guns and "see what happens to her".

He told supporters his rival wanted to "destroy your second amendment" - referring to the right to own guns.

Mrs Clinton's team has accused Mr Trump of "inciting people to violence".

Speaking at a rally in Miami on Friday, the Republican candidate said: "I think that her bodyguards should drop all weapons. They should disarm, right?'

And on Thursday, Jimmy Fallon asked if he could mess it up.

First, Trump winced and grimaced, shaking his head as the "Tonight Show" audience erupted in a smattering of applause and cheers.

Moments later, the Republican nominee relented.

"The answer is yes, but the people in New Hampshire, where I'm going to be in about an hour from now, I hope they're going to understand," Trump said. "Go ahead."

Trump's signature coif has long been the subject of intense scrutiny, including from those who've questioned whether Trump's do is the real thing.

The Republican candidate had been a leader of the "birther" movement that questioned Hawaii-born Mr Obama's citizenship.

But his campaign now accuses his Democratic rival Hillary Clinton of introducing the "smear" during the 2008 Democratic nomination contest.

There is no evidence to link Mrs Clinton to the birthers.

In reaction she tweeted that President Obama's successor "cannot and will not be the man who led the racist birther movement".

As the campaign enters its final stretch, some of Donald Trump's children are showing signs of impatience and struggling to stay on message.

In the past 24 hours, Ivanka Trump and Donald Trump Jr. have cut off interviews when pressed for answers on tough questions. Trump Jr. strayed from the campaign's talking point about the Republican nominee's tax returns -- that they'll be released once an IRS audit concludes -- when he said unveiling the documents would "detract" from his father's message.