On Saturday, a beleaguered Trump sought to undermine the legitimacy of the presidential election, pressing unsubstantiated claims the contest is rigged against him, vowing anew to jail Clinton if he's elected and throwing in a baseless insinuation his rival was on drugs in the last debate. So I think we should take a drug test.
"I don't know what's going on with her", Trump said.
"Why don't we do that?"
"She could barely reach her auto", Trump added, in what I assume was a reference to that time she had to be helped into her vehicle after almost passing out during a 9/11 memorial.
Clinton and Trump are scheduled to take the stage together for their final debate October 19 at the University of Nevada-Las Vegas.
Donald Trump has been raising doubts about the integrity of the election for months, but his running mate and other GOP leaders are taking a more cautious tone.
Trump, in a burst of tweets overnight and early Sunday, said repeatedly that U.S. media are rigging the election by hammering away at what he calls fabricated accounts that he made unwanted sexual advances against women.
In the past week, Trump's campaign has been hit by allegations the NY billionaire sexually accosted several women over the past three decades.
Speaker of the House Paul Ryan issued a rebuke of GOP presidential nominee Donald Trump Saturday, criticizing comments that question the validity of the electoral process. When he suggested that Clinton had been a less-than-stellar campaigner, Clinton noted that she had prepared for the debate and "prepared to be president". As sexual misconduct claims against Trump dominate the campaign, is it hard for Mrs Clinton to speak out because she stayed beside her husband Bill even as he was mired in the Monica Lewinsky and other sex scandals, humiliating her on his way to being impeached. They lean Democratic but don't have a long history of voting and are already skeptical of Clinton.
Mr Trump began this month with 75 million dollars (£61 million) in his campaign and joint party accounts.
Clinton stayed out of the spotlight this week, as President Obama and First Lady Michelle Obama hit the trail on her behalf.
Of course, Trump throwing out this drug test challenge - which Trump certainly doesn't expect Clinton to accept -could backfire on him if she actually did accept it.
His White House campaign in chaos over snowballing accusations of sexual assault, Trump has cast himself as the victim of a "smear campaign", and further escalated his attacks on his rival heading into the final weeks of the race.
"In a democracy, you have a contest, but if you lose then you say congratulations and you move on", said the USA leader, whose second term ends January 20. Trump tweeted on Sunday, a sentiment he also expressed in posts and during rallies in ME and New Hampshire on Saturday.
With 23 days left in the race, Clinton's campaign could suffer a setback with the release of the latest batch of hacked emails by Wikileaks on her relationship with Wall Street.
The latest batch showed the campaign worrying whether Sen.
Clinton, who has faced intense scrutiny about her health during the campaign (including her brief bout of pneumonia), and her campaign have batted back the accusations by pointing to her health records.
"Hello, and welcome to the second and worst-ever presidential debate", moderator "Martha Raddatz" says before she and "Anderson Cooper" do shots.
"Hillary Clinton should have been prosecuted and should be in jail", Trump tweeted on Saturday. I think we should take a drug test.
Trump's claim - made without evidence - undercuts the essence of American democracy, the idea that US elections are both free and fair, with the vanquished peacefully stepping aside for the victor.
But Trump primarily raised the allegations to argue again that the media outlets reporting on the allegations - many of which describe actions Trump bragged about in a 2005 conversation that surfaced last week - are doing so to sink his campaign.