New York, Dec 12 (IANS): Democratic Senator Kirsten Gillibrand of New York has called on President Donald Trump to resign over allegations of sexual assault, the media reported.

"President Trump has committed assault, according to these women, and those are very credible allegations of misconduct and criminal activity, and he should be fully investigated and he should resign," the senator told CNN on Monday night.

"These allegations are credible; they are numerous... I've heard these women's testimony, and many of them are heartbreaking," said Gillibrand, a leading voice in Congress for combating sexual assault in the military.

If he does not "immediately resign," she said, Congress "should have appropriate investigations of his behaviour and hold him accountable".

Also on Monday, Democratic Senator Ron Wyden of Oregon also called on Trump to resign in a tweet, encouraging Capitol Hill to investigate.

"These women are right. If @realDonaldTrump won't resign, Congress must investigate allegations by many, many women that he sexually assaulted and harassed them. No one is above the law," he tweeted.

Gillibrand told CNN: "Not only should women be heard, but they should be believed."

On Sunday, UN Ambassador Nikki Haley said that Trump's accusers "should be heard".

White House press secretary Sarah Sanders responded to Haley's comments at a news briefing on Monday, where she reiterated that Trump "thinks it's a good thing that women are coming forward" but noted that he denies the allegations.