Mike Gallagher
Rep. Mike Gallagher, a Wisconsin Republican, (center) opposed impeaching Homeland Security Secretary Alejandro Mayorkas.
  • Republicans who opposed DHS Secretary Alejandro Mayorkas' impeachment have warned about what's to come.
  • They fear that impeachment now will become a completely political tool.
  • Some constitutional scholars share their concerns as well.

Homeland Security Secretary Alejandro Mayorkas is only the second Cabinet secretary to be impeached in American history. Some Republicans are worried that the case against him is so weak that Tuesday night's vote is destined to become a harbinger of what's to come.