San Antonio U.S. Rep. Joaquin Castro blasted Florida Gov. Ron DeSantis’ pledge during Wednesday’s GOP presidential debate to send U.S. troops into Mexico as a move “down a dark, dangerous path.” DeSantis’ claim that he’d invade the United States’ southern neighbor came after Fox News’ Martha MacCallum, a debate co-moderator, asked DeSantis if he would “support sending U.S. special forces over the border into Mexico to take out fentanyl labs” and other cartel operations.   “Yes!