As it happened: Trump v Clinton round two

Republican vice-presidential candidate Mike Pence has cancelled a fundraising event in Ocean County, New Jersey, that was supposed to be held on Monday, according to US media.

Trump said in tonight's debate that he disagreed with a comment made about Russia by his running mate during the VP debate last week.

Pence on Saturday condemned the video of Trump making sexist remarks about women, saying "I do not condone his remarks and cannot defend them".

Scores of Republicans have deserted Trump after those remarks came to light.

But Pence did tweet-congratulate his boss following the debate saying: "Proud to stand with you as we Make America Great Again."

The expressions of voters who viewed the debate at watch parties across the US say it all.

Trump supporter Ken Wilkison cheers as he watches at a bar in Denver, Colorado:

AFPCopyright: AFP

AFPCopyright: AFP

Clinton supporters watch the debate at a Chinese restaurant near the US-Mexico border in Calexico, California:

APCopyright: AP

Trump supporter Debra Earnes reacts to an exchange while watching the debate at a Republican party office in Thornton, Colorado:  

AFPCopyright: AFP

Ken Bone, who asked a technical question about energy policy, has found fame on Twitter.

His question was: "What steps will your energy policy take to meet our energy needs, while at the same time remaining environmentally friendly and minimizing job loss for fossil power plant workers?"

Good work, internet!  

Kellyanne Conway, Trump's campaign manager, appeared to slip up while talking to MSNBC's Chris Matthews. 

Matthews asked: "So you’re with the campaign till the bitter end?"

"I’m with the campaign till the bitter end,” Conway responded. "Unless…"

After a dramatic pause, she appeared to recover. 

"Who knows? But I'm sitting here as his campaign manager, I'm sitting here with you in the debate hall where he just performed beautifully."

“So you’re worried about more shoes dropping,” Matthews pressed.

“No, I didn’t say that," she said. 

'"I’ve made a commitment”, she continued before declaring Trump won the debate.

The Khan family, who were the subject of repeated attacks by Trump after they spoke out against him during the Democratic convention, have reacted to the Republican nominee's comment tonight calling their son a hero. Captain Khan was killed in Iraq by a suicide bomber in 2004.

Muslim social media users are mocking Donald Trump, who said that they should "report when they see something going on".

The hashtag lit up on social media.

Twitter said this was the most retweeted tweet of the night:

Republican National Committee Chairman Reince Priebus has called for a conference call on Monday, Politico reports. 

According to Twitter, tonight's #debate was the most tweeted ever, with more than 17 million debate-related tweets posted.

Today was also the most tweeted day of the entire 2016 election season, with nearly 30 million tweets sent. 

Clinton's foreign policy spokesman tweeted a graphic insult at Donald Trump during the debate tonight.

He soon apologised.

TwitterCopyright: Twitter

TwitterCopyright: Twitter

Republican pollster Frank Luntz's focus group swung in Trump's favour.

Of course, there are a few less scientific surveys out there that supporters like to flood to crown their candidate as the true winner - like this Drudge poll:

BBCCopyright: BBC

If you're just joining us, here are the main flashpoints of the night in clips.

It began badly with the two candidates shunning the traditional handshake:

Trump soon drops the bomb by dredging up Bill Clinton's sex scandals:

The zinger of the night on Clinton emails?

He pummels her some more on emails:

Clinton fights back by saying the Trump 'hot mic' sex tapes "represent exactly who he is", but he says he has "great respect for women".

Trump admits playing the system to avoid paying federal income tax:

Clinton and Trump joust over his proposed Muslim ban: