A federal judge ruled on Monday that former President Donald J. Trump and a lawyer who had advised him on how to overturn the 2020 election most likely had committed felonies, including obstructing the work of Congress and conspiring to defraud the United States.

Mr. Trump has not been charged with any crime, but it essentially ratified the committee’s argument that Mr. Trump’s efforts to block Congress from certifying Joseph R. Biden Jr.’s Electoral College victory could well rise to the level of a criminal conspiracy.

“The illegality of the plan was obvious,” wrote Judge David O. Carter of the Central District of California. “Our nation was founded on the peaceful transition of power, epitomized by George Washington laying down his sword to make way for democratic elections. Ignoring this history, President Trump vigorously campaigned for the vice president to single-handedly determine the results of the 2020 election.”

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