At least two people were killed and several were injured in the severe storm on Tuesday that heavily damaged areas of Illinois and Indiana.

Julie T. Le, a former government lawyer, described in stark terms how overstretched the legal system had become during the administration’s immigration crackdown in Minnesota. Now, she said, she hopes to fix the “system’s failures” by running for Congress.

In public comments and private meetings at a House G.O.P. retreat, top officials allowed that President Trump’s immigration crackdown had hurt the party and that they needed a course correction on the issue.