Worst nightmare has already happened, a former NFL general manager said. worst nightmare as a GM is if you sign Colin Kaepernick and the president has you in his sights. You saw what happened, and it going to happen again. Any time he 1/8Trump3/8 wants to change the subject, from health care or whatever, he going to come back to this. He a master at it, no matter what you think of him. It what he does. Does your team…