"A woman I don't know and, to the best of my knowledge, never met, is on the FRONT PAGE of the Fake News Washington Post saying I kissed her (for two minutes yet) in the lobby of Trump Tower 12 years ago", he wrote to his 41 million followers.
Rachel Crooks said that Trump cornered her near the elevator bank on the 24th floor of Trump Tower, kissed her cheeks and "kissed me directly on the mouth".
In response to the Republican president's tweets, Crooks, who is running as a Democrat for a seat in the Ohio State House of Representatives, challenged Trump to release video of their alleged encounter.
Rachel Crooks, 35, has told her story publicly many times in the hope of revealing who the real Donald Trump is. She never said the kiss happened in the Trump Tower lobby. "He wouldn't let go of my hand, and then he went right in and started kissing me on the lips", she told the Post.
'He started kissing me on one cheek, then the other cheek.
"I just want people to listen. The whole thing probably lasted two minutes, maybe less".
Ms Crooks went public during the 2016 election.
"Never happened! Who would do this in a public space with live security, " he stressed.
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Crooks, who is one of several women who have said Trump engaged in various forms of sexual harassment with them in the past, said he kissed her without her consent in 2006 when she was working for a company that had offices in Trump Tower.
Now, she is running for office in OH for the state legislature.
Trump lawyer Michael Cohen recently admitted that he paid former porn star Stormy Daniels $130,000 just before the 2016 election.
Trump has consistently denied the allegations, calling them "total fabrications" and tweeting once that "Nobody has more respect for women than me".
"You know I'm automatically attracted to beautiful - I just start kissing them".
In the same Times report, Trump defiantly denied the allegations: "None of this ever took place", he told the paper, which noted that he "began shouting at the Times reporter who was questioning him" and "said that The Times was making up the allegations to hurt him and that he would sue the news organization if it reported them".
Ms Crooks seems disappointed that her story - along with those of a dozen other women - appears to have had no ramifications for the President.