In the wake of the F.B.I. search of former President Donald J. Trump’s property in Florida, the House committee investigating the Jan. 6 attack on the Capitol is gearing up to meet with two potentially key witnesses in its separate inquiry on Tuesday.
The committee is expected to meet with Mike Pompeo, the former secretary of state under Mr. Trump, and Douglas V. Mastriano, the Republican nominee for governor of Pennsylvania who served as a point person in the state for a plan to keep Mr. Trump in power by using slates of “alternative” or “fake” electors.