Former foreign policy adviser to Sen. John McCain, R-Ariz., and Sen. Marco Rubio, R-Fla., Max Boot, a lifelong Republican who is not supporting Donald Trump, told Yahoo Global News Anchor Katie Couric that he’s “disappointed” in his former bosses’ support for Trump and that the Republicans who support him “all know in their gut that he’s nuts.” He also said, “They’re certainly not profiles in courage at the moment.”