Chaffetz and Manchin need to switch parties with each other. Didn’t DJT just put Chaffetz in charge of investigating Clinton crimes? Fox. Henhouse. Don’t trust him.
The president doesn’t put a Congressman in charge of anything unless the Congressman resigns. House Congressional investigations are assigned by the Speaker of the House, usually after consultation with other Congressional leaders.
(Chaffetz took over the Oversight Committee because Ryan found Issa to aggressive.)