He said that if Democrats took power, he would expect the committee to immediately subpoena records from the White House and the F.B.I., which conducted an abbreviated supplemental background investigation into two of the misconduct claims. That document request would include communications between officials at both entities.
The committee would also seek to interview Judge Kavanaugh’s accusers and the dozens of potential witnesses they identified in recent days, most of whom were not contacted by the F.B.I. He said he would also call the F.B.I. director, Christopher A. Wray, to testify.
One of Dr. Blasey’s lawyers said that her client only wanted to tell her story and did not support impeachment.
Mr. Nadler’s comments are likely to be seized on by Republicans, who have accused Democrats of waging a campaign to discredit Judge Kavanaugh at all costs. They argued on Friday that Democrats would never be satisfied with any investigation, and they say that it is the Democrats who are trying to undercut the legitimacy of the Supreme Court.