Republican Rep. Michael McCaul of Texas, the former chair of the House Foreign Affairs Committee who had once been a big supporter of USAID, tells "Face the Nation with Margaret Brennan" that the organization "needs to return to the core mission principles.

This week on "Face the Nation with Margaret Brennan," as the Trump administration continues its dismantling of USAID, Republican Rep. Michael McCaul and Democratic Rep. Ilhan Omar join to discuss. Plus,