A former House investigator of the Jan. 6 attacks warned Tuesday that Trump looks at federal agencies as “tools of his own exertion of power” — and warned it’s not just the Justice Department. Tim Heaphy served as a senior investigator to the House Select Committee that probed the 2020 election overthrow attempts and Jan. 6 attacks. MSNBC host Nicolle Wallace asked him Tuesday about Donald Trump’s desire for military-style tribunals for people like former Reps. Liz Cheney (R-WY) and Adam Kinzinger (R-IL), who served on the Jan. 6 committee, judicial officials, or members of the press. Want mor…