On Tuesday, Donald Trump stood in front of more than 800 generals and admirals in the U.S. military and informed them of their new enemy: their fellow Americans. “Our history is filled with military heroes who took on all enemies — foreign and domestic,” Trump said. “You know that phrase very well. That’s what the oath says: foreign and domestic. Well, we also have domestic. George Washington, Abraham Lincoln, Grover Cleveland, George Bush, and others all used the armed forces to keep domestic order and peace. … Now they like to say, Oh, you’re not allowed to use the military.”...