Donald Trump minimized the brain injuries suffered by U.S. troops during his presidency as “headaches,” and MSNBC’s Mika Brzezinski winced in disgust. The former president insists that “nobody was ever tougher on Iraq” than him, apparently referring to Iran, and he claimed that an Iranian attack on U.S. troops in 2020 had failed and downplayed the traumatic brain injuries suffered by more than 100 of the troops under his leadership as commander in chief. “What does injured mean?” Trump said Tuesday during a campaign stop in Wisconsin. “You mean because they had a headache? Because the bombs ne…