Donald Trump has hinted there may be more recordings of him making lewd remarks which could surface before election day.
It follows rumours there are further examples of the Republican presidential hopeful using sexist or inappropriate language while filming reality TV shows.
At a rally in Pennsylvania, the embattled candidate said: "If they want to release more tapes saying inappropriate things, we'll continue to talk about Bill and Hillary Clinton doing inappropriate things. There are so many of them."
Cast and crew on the US version of 'The Apprentice' have claimed Mr Trump frequently made offensive remarks while shooting the show.
Mark Burnett, the executive producer of the series, has said he does not have the right to release any behind-the-scenes footage from the programme.
The latest crisis to engulf Mr Trump's campaign was sparked by a 2005 recording where he was heard boasting about his ability to grab women by the crotch with impunity.
During Sunday's presidential debate, Mr Trump described his remarks as "locker room talk".
Nancy O'Dell, the TV host he was talking about in the controversial recording, addressed his comments on her show yesterday, saying: "There is no room for objectification of women, or anyone for that matter. Not even in the locker room."
Senior Republicans have been distancing themselves from Mr Trump as the scandal rumbles on, with the Speaker of the House of Representatives Paul Ryan saying he could no longer "defend" his party's nominee.
Mr Ryan told fellow Republicans on a conference call that he would not campaign with the real estate mogul for the rest of the race.
He did not respond directly when asked whether he would still vote for Mr Trump, but later clarified that he was not rescinding his endorsement of the GOP nominee.
An angry Mr Trump hit back on Twitter, writing: "Paul Ryan should spend more time on balancing the budget, jobs and illegal immigration and not waste his time on fighting the Republican nominee."
Paul Ryan should spend more time on balancing the budget, jobs and illegal immigration and not waste his time on fighting Republican nominee
— Donald J. Trump (@realDonaldTrump) October 10, 2016
His poll numbers have dropped further since the damning footage began to circulate.
There are fears among Republican members of Congress that his chaotic campaign could inflict long-term damage on the party - and ruin their chances of holding on to majorities in both the House of Representatives and the Senate next month.
