J. Scott Applewhite/AP
- Homeland Security Secretary Alejandro Mayorkas sent a fiery defense of his record to a top House Republican.
- Rep. Mark Green's Homeland Security Committee will consider Mayorkas' impeachment Tuesday morning.
- In his letter, Mayorkas told Green that "your false accusations do not rattle me."
Homeland Security Secretary Alejandro Mayorkas penned a blistering rebuttal on Tuesday morning hours ahead of House Republicans' expected vote that moves the party one step closer to impeaching the first Cabinet secretary in almost 150 years.