In the second presidential debate that turned nasty from the start, Clinton did not shake hands with the 70-year-old Republican nominee as the two rivals walked on the stage at the Washington University here - a clear sign of the escalated rivalry between them - before proceeding for the fiery 90- minute clash attacking each other's character.
Polls conducted soon after the showdown, which was the most tweeted presidential debate ever, declared the Democrat as the winner though they did give Trump the credit for "exceeding expectations".
When pressed on whether the ban is no longer his position, Trump called it an "extreme vetting from certain areas of the world".
While Clinton alleged that the real estate tycoon's 2005 video of lewd and sexually explicit remarks against women - that jolted his White House campaign and prompted a top Republican leaders to abandon him - reflects "the real" Trump, he accused her husband Bill Clinton of sexual assault of women over the past several decades.
Under pressure following the backlash over the video as well as his past performance at the first presidential debate on September 27 which media said was "agitated" and "ignorant", Trump appeared defiant.
The billionaire also vowed, if elected as the US President, to launch a special investigation against Clinton over her use of a private email server during her tenure as secretary of state under US President Barack Obama from 2009-2013 and ensure she is jailed.
Clinton hit back, saying "everything he just said is absolutely false, but I'm not surprised," she said.
"Oh, really?" Trump remarked.
"It is just awfully good that someone with the temperament of Donald Trump is not in charge of the law in our country," Clinton said.
Faced with a make-or-break situation in his campaign,
Trump convened a surprise meeting of women who have previously accused former president Bill Clinton of sexual misconduct, just hours before the debate, the second of three planned debates before the November 8 election. The final showdown will be held on October 19 in Las Vegas.
When pressed on his controversial call for ban by moderator, Trump said the ban in "some form has morphed into an extreme vetting from certain areas of the world".
Trump said he did not want to see hundreds of thousands of people coming in from Syria "when we know nothing about them, we know nothing about their values, and we know nothing about their love for our country".
The CNN/ORC poll of debate watchers said Clinton was the "clear winner" in the contest, with 57 per cent saying Clinton won as opposed to 34 per cent for Trump. CNN said it was a strong showing for Clinton, but not as good as her performance at the first presidential debate, when 62 per cent of debate watchers said she won.
Trump denied actions he bragged about on tape. The former reality TV star refrained from giving a direct answer to the question if he actually kissed women or groped them without consent. "I have great respect for women.
"And I will tell you: No, I have not," Trump said.
"Nobody has more respect for women than I do ... I've said things that, frankly, you hear these things I said. And I was embarrassed by it. But I have tremendous respect for women.
"If you look at Bill Clinton, far worse. Mine are words, and his was action. His was what he's done to women. There's never been anybody in the history politics in this nation that's been so abusive to women. So you can say any way you want to say it, but Bill Clinton was abusive to women," Trump said, adding Hillary Clinton "attacked those same women and attacked them viciously".
"But he never apologises for anything to anyone," she added.
"We have never in the history of our country been in a
situation where an adversary, a foreign power, is working so hard to influence the outcome of the election. And believe me, they're not doing it to get me elected. They're doing it to try to influence the election for Donald Trump," Clinton alleged.
Calling the situation in Syria "catastrophic", said Russia is not doing anything to contain ISIS in the region, and pointed out that when she was the secretary of state, she advocated a no-fly zone and safe zone.
Trump denied allegations over being close to Putin. "I don't know Putin. I think it would be great if we got along with Russia because we could fight ISIS together, as an example. I don't know Putin."
"Of course I do. And so do all of her donors, or most of her donors. I know many of her donors. Her donors took massive tax write-offs," he said in response to a question.
"I will tell you that number one I pay tremendous numbers of taxes. I absolutely use it, and so did Warren Buffett. And so did George Soros and so did many of the other people that Hillary is getting money from. Now I won't mention their names because they're rich, but they're not famous. So we won't make them famous," he added.
Trump also said the former secretary of state should apologise to Obama for raising the birther issue. "You're the one that sent the pictures around your campaign, sent the pictures around with President Obama in a certain garb. That was long before I was ever involved, so you actually owe an apology."
Clinton - whom Trump accused of having "hate in her heart" - hit back, saying he has never apologised to anyone, and that he owes an apology to Obama and the country.
Obama's former attorney general Eric Holder led the broad condemnation of Trump's threat, as critics painted him as a dictator in the making.
Clinton - whom Trump accused of having "hate in her heart" - hit back, saying he has never apologised to anyone, and that he owes an apology to Obama and the country.
Obama's former attorney general Eric Holder led the broad condemnation of Trump's threat, as critics painted him as a dictator in the making.
"In the USA we do not threaten to jail political opponents. @realDonaldTrump said he would. He is promising to abuse the power of the office," Holder tweeted.
Nobel Prize winning economist Paul Krugman said: "Let's be clear: a candidate for president promised to put his opponent in jail if he wins. Everything else is secondary.
Trump was also called as undemocratic by a number of fellow Republicans.
"Winning candidates don't threaten to put opponents in jail," said former George W Bush White House spokesman Ari Fleischer. "Presidents don't threaten prosecution of individuals. Trump is wrong on this.
Nobel Prize winning economist Paul Krugman said: "Let's be clear: a candidate for president promised to put his opponent in jail if he wins. Everything else is secondary.
Trump was also called as undemocratic by a number of fellow Republicans.
"Winning candidates don't threaten to put opponents in jail," said former George W Bush White House spokesman Ari Fleischer. "Presidents don't threaten prosecution of individuals. Trump is wrong on this.
