A growing number of House lawmakers are the subject of or involved in federal investigations.

The unrelated investigations concern both Republicans and Democrats. And along with any legal moves by federal enforcement, the cases may leave some of the members vulnerable in their primary elections this year. In two of three known cases, the districts could flip party control. That’s notable in a political environment in which House Republicans need to net only five seats in the 435-seat chamber to win back a majority since losing it in the 2018 midterm elections.