From The Christian Science Monitor:

There are other ways to give congressional oversight efforts some bite, says Kevin Kosar, congressional scholar and vice president for policy at the R Street Institute in Washington. They could hold up confirmations for appointees or block bills that administration officials have an interest in. Even starting impeachment hearings could move the needle in Congress’s favor, even if there’s no expectation the president would ever be convicted.

“There are a lot of possibilities for those who want to put the energy in to try to change the behavior of the executive branch or any individual within it,” Mr. Kosar says. “But it requires grit. You have to use the tools at your disposal, stay consistent, and stay on them.”