Rep. Jamie Raskin has a long history of trying to check Donald Trump’s power. He led Trump’s second impeachment after the January 6 breach of the Capitol, and served on the January 6 Select Committee, which investigated the president’s role in the violent attempt to prevent Joe Biden’s election certification. Now in the minority with little power, Raskin is ramping up scantily resourced investigations into the administration, laying the groundwork for what oversight might look like should Democrats win control of the House in November. (Also on his wishlist: investigations into F.B.I. director Kash Patel steering bonus payments to loyalists and special envoy Jared Kushner’s “staggering” financial conflicts in the Middle East.)