The current committee plan is for only two witnesses - one would be Ford, to be followed then by Judge Kavanaugh, who has sternly denied any wrongdoing involving Ford.
GOP Senators and the White House said Ford has offered no corroborating evidence to back up her allegations.
"Dr. Christine Ford claimed she was assaulted at a house party attended by four others," said White House spokesperson Kerri Kupec. "Since then, all four of these individuals have provided statements to the Senate Judiciary Committee denying any knowledge of the incident or even having attended such a party.”
"These official letters from the 4 named by Dr Ford — denying any knowledge of what Dr Ford has alleged — serve the same purpose as sworn testimony," said Sen. Orrin Hatch (R-UT).
The Thursday hearing would be a high stakes political event, drawing immediate comparisons to the extra hearings held for the Supreme Court nomination of Clarence Thomas, when he defended himself against public accusations of sexual harassment by law professor Anita Hill.
Unlike that hearing in October of 1991, neither Kavanaugh nor Ford is currently expected to have testimony from additional witnesses.