The shift in the committee’s perspective on making a referral was prompted in part by a ruling two weeks ago by Judge David O. Carter of the Federal District Court for Central California. Deciding a civil case in which the committee had sought access to more than 100 emails written by John C. Eastman, a lawyer who advised Mr. Trump on efforts to derail certification of the Electoral College outcome, Judge Carter found that it was “more likely than not” that Mr. Trump and Mr. Eastman had committed federal crimes.

The ruling led some committee and staff members to argue that even though they felt they had amassed enough evidence to justify calling for a prosecution for obstructing a congressional proceeding and conspiring to defraud the American people, the judge’s decision would carry far greater weight with Mr. Garland than any referral letter they could write, according to people with knowledge of the conversations.

The members and aides who were reluctant to support a referral contended that making one would create the appearance that Mr. Garland was investigating Mr. Trump at the behest of a Democratic Congress and that if the committee could avoid that perception it should, the people said.