Sherman's move has put him at odds with House Democratic leaders, who have tried to quiet talk of impeachment, hoping instead to focus on the economy, healthcare and the investigation into Russia's interference in the presidential election.

Sherman, an 11-term Democrat who represents part of the San Fernando Valley, was the first to draft and circulate articles of impeachment last month. He formally introduced the measure, HR 438, on the House floor Wednesday afternoon.

The measure accuses Trump of obstruction of justice and seeking to "use his authority to hinder and cause the termination" of an investigation into former national security advisor Michael Flynn, including "through threatening, and then terminating, James Comey."

Rep. Al Green (D-Texas), who had previously held a joint news conference with Sherman supporting the effort to impeach Trump, was the only co-sponsor of the measure.

Sherman had previously said no other members had signed on to support his proposal. After House Democratic leaders expressed concern about his effort, Sherman said he assured House Minority Leader Nancy Pelosi that he wouldn't ask for a floor vote on impeachment without consulting the Democratic caucus.