WASHINGTON — A nearly unified wall of G.O.P. opposition to Judge Ketanji Brown Jackson cracked slightly on Monday as two more Senate Republicans said they would side with Democrats in supporting her, paving the way for her confirmation as the first Black woman on the Supreme Court.

Senators Mitt Romney of Utah and Lisa Murkowski of Alaska joined a third Republican, Susan Collins of Maine, in lending their support to Judge Jackson, defying deep resistance in their party to the nominee. The G.O.P. opposition was underscored anew on Monday when all 11 Republicans on the Judiciary Committee voted against the nomination.

That prompted Democrats to use an unusual procedure to force the nomination out of the deadlocked panel with a vote of the full Senate, which agreed to the move by a vote of 53 to 47. The three Republicans gave President Biden at least a modicum of the bipartisan backing he had hoped for ahead of a confirmation vote now expected as early as Thursday.

And it was a counterpoint to the bitterly partisan debate over Judge Jackson, in which Republicans on the judiciary panel attacked her as a liberal partisan with a questionable record, glossing over her qualifications and experience in hearings that featured the airing of conservative grievances, accusations of leniency toward child sexual abusers and divisive questions, including how she would define the word “woman.”