The House begins debating impeachment charge against Trump.

The House set itself on a course to impeach President Trump on Wednesday for a historic second time, planning an afternoon vote to charge him just one week after he incited a mob of loyalists to storm the Capitol and stop Congress from affirming President-elect Joseph R. Biden Jr.’s victory in the November election.

Returning to a heavily fortified Capitol, protected by thousands of National Guard, lawmakers began what was expected to be a daylong debate on an article of impeachment that accuses the president of “inciting an insurrection” that...