Los Angeles: A Californian lawmaker has introduced articles of impeachment against US President Donald Trump, making good on a promise he made to move the process forward.

Brad 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, titled 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 adviser Michael Flynn, including "through threatening, and then terminating, James Comey".

Democrat Al Green of 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.