COMEY on Trump's tweet calling Cohen a "rat": "It undermines the rule of law. This is the president of the US calling a witness who is cooperating w/his own DOJ a rat. Say that again to yourself at home and remind yourself where we ended up...we have to stop being numb to it" pic.twitter.com/MdPRPi2D3s— Aaron Rupar (@atrupar) December 17, 2018