McCarthy has stepped way out of bounds in calling for an investigation of the Manhattan District Attorney over his investigation of Trump. It seems to me any federal investigation should come from the DOJ, not the House of Representatives. It is nothing more than harassment and intimidation in an effort to protect Trump. If this isn't abuse of office and grounds for impeachment, it sure makes a good case.

House Speaker Kevin McCarthy (R-Calif.) on Saturday announced a congressional investigation into the local prosecutors reportedly preparing to indict former President Trump.
[snip]
McCarthy accused Manhattan DA Alvin Bragg of “an outrageous abuse of power” and of “pursu[ing] political vengeance against President Trump” in a tweet posted Saturday morning.

“I’m directing relevant committees to immediately investigate if federal funds are being used to subvert our democracy by interfering in elections with politically motivated prosecutions,” McCarthy said.
SOURCE