The New Yorker was unable to confirm with eyewitnesses that Kavanaugh was at the party Ramirez described, though one classmate who was not at the party said that he is "one-hundred-per-cent sure" he was told Kavanaugh had exposed himself to Ramirez.
"They're really con artists", Trump said of Democrats.
Kavanaugh's TV appearance came three days before a crucial Senate Judiciary Committee hearing at which he and his chief accuser, Christine Blasey Ford, were slated to testify.
Kavanaugh's approval was only two weeks ago considered a done deal, with all Republicans in the narrowly divided Senate appearing set to back him.
Supporters hope that Kavanaugh's nomination can be confirmed before the start of the court's next term on October 1.
"He's a high quality person, he's a great intellect", Trump said in remarks to reporters at the United Nations, accusing Democrats of portraying Kavanaugh as someone he is not.
Kavanaugh has denied Ramirez's accusation and labeled it a "smear".
Trump blasted Democrats and accused them of "playing a con game" in order to derail Kavanaugh's confirmation.
"I think the longer this hangs out there, the more problematic that it is", he said. She admits that she was drunk.
Sen. Orrin Hatch, R-Utah, a member of the Judiciary Committee, referred to Ramirez's allegation as "phony", and when pressed on why he characterized it that way, Hatch responded: "Because I know it is". Taylor Foy, a spokesman, complained that Democrats had "actively withheld information" from the Republicans until now. When the attorney finally answered, according to Kennedy: "he said 'we are not issuing a statement.' He said 'if you want our statement, read the New Yorker'".
Sen. Lindsey Graham, a Republican from SC, said Ford should have her say, but that his mind is already made up. On Sept. 21 he shamed Professor Ford for not coming forward when she says the alleged sexual assault attempt occurred.
McConnell on Tuesday continued to defend Kavanaugh.
Ford alleges that a drunken Kavanaugh and another boy shut her in a room and tried to tear her clothes off at a high school beer party in suburban Washington around 1982, when she was 15 and he 17. She is slated to testify before the committee at 10 a.m. on Thursday. And the people who have known and worked with him, including people in high school and people who went to law school with him, say does not comport with the Brett Kavanaugh we knew at this period of our life.
Michael Avenatti, a lawyer who represents a porn star claiming to have had an affair with Trump, has said he is also representing a possible third Kavanaugh accuser, whom he has not identified. A handful of senators in both parties remain undecided on his nomination.
"Oh, gee, let's not make him a Supreme Court judge because of that?"
Trump went on: "There's a chance that this could be one of the single-most unfair, unjust things to happen to a candidate for anything but I am with Judge Kavanaugh and I look forward to a vote". Capitol Hill reporters tracking all this don't think that Kavanaugh, at this time, has the 50 or 51 votes he needs to get on the court, but Senate Republican leaders seem to be gambling that he will after Thursday.
The committee also scheduled a vote on Kavanaugh's nomination for Friday at 9:30 a.m. (1330 GMT).