Democratic Sen. Mazie Hirono of Hawaii is the sixth member of the upper chamber to call for President Donald Trump to resign.
The senator cited allegations of sexual assault against Trump and comments he made about one of Hirono's Senate colleagues, Democratic Sen. Kirsten Gillibrand of New York, Politico reports. At least 16 women have accused Trump of sexual misconduct.
"The only thing that will stop him from attacking us -- because nobody’s safe -- is his resignation," Hirono told NBC News on Dec. 12.
Hirono repeated her statement that same day on Twitter, writing: "[Trump] is a misogynist, compulsive liar, and admitted sexual predator. Attacks on Kirsten are the latest example that no one is safe from this bully. He must resign."
Other senators calling for Trump to step aside include Gillibrand, Democratic Sen. Ron Wyden or Oregon, Independent Sen. Bernie Sanders of Vermont, Democratic Sen. Jeff Merkley of Oregon and Democratic Sen. Cory Booker of New Jersey.
Trump stated on Twitter on Dec. 12 that the statements by Gillibrand and others are based on "false accusations and fabricated stories of women who [he doesn't] know and/or have never met."
The president added that the Democrats were spreading this "fake news" because they have been unable to find evidence of collusion between the Trump presidential election campaign and the Russian government.
Trump's suggestion that he does not know or has never met his accusers is false, since one of them is a reporter who interviewed him, another is a former business partner and a third was a candidate on his reality TV show, Politico reports.
Trump also targeted Gillibrand personally, describing her in a second tweet as a "lightweight and total flunky" for Senate Minority Leader Charles Schumer of New York. He went on to allege that Gillibrand once begged him for campaign contributions, "and would do anything for them," according to CNN.
Democratic senators reacted angrily to Trump's criticism of Gillibrand. Sen. Richard Blumenthal of Connecticut told journalists on Capitol Hill it was a "sexist slur that disgraces the office and diminishes the presidency."
"Are you really trying to bully, intimidate and slut-shame [Gillibrand]?" wrote Sen. Elizabeth Warren of Massachusetts on Twitter. "Do you know who you're picking a fight with? Good luck with that, [Trump]. Nevertheless, #shepersisted."
White House Press Secretary Sarah Huckabee Sanders dismissed Warren's interpretation of Trump's tweet, saying "only if your mind is in the gutter would you have read it that way."
Speaking at a press briefing on Dec. 11, Huckabee Sanders rejected the allegations against Trump.
"In terms of the specific eyewitness accounts (disputing the allegations) there have been multiple reports, and I'd be happy to provide them to you after the briefing has completed," she said.