MSNBC host Lawrence O'Donnell challenged Republican nominee Mitt Romney's son, Tagg, to a fight at the conclusion of his program Thursday evening:

LAWRENCE O'DONNELL: Okay, Taggert, let's have a little talk, just you and me. When I hear you talk about taking a swing and taking punches, why do I get the feeling that you have never actually taken a punch or thrown a punch? I didn't have that luxury in the part of Boston that I grew up in, but in your rich, suburban Boston life, with your father filling $100 million trust fund for you? I don't know. I just get the feeling that things were different for you. Now, I know you've got a lot — a lot — to be pissed off at these days starting with the name Taggert, which you have every right to be pissed off with every day for the 42 years of your life. Let me try to help you deal with his aggression you are feeling right now. You're mad at President Obama for calling your father a liar? Let's get something straight. He didn't call your father a liar. I did. The president just said that what your father said isn't true. I have been saying all year that your father is a liar, I've repeatedly said that, that your father lies and has been trying to lie his way into the White House. So you want to take a swing at someone for calling your old man a liar? Take a swing at me, and don't worry, there won't be any Secret Service involved. Just us. And I'll make it easy for you. I'll come to you any time, anywhere. Go ahead Taggert, take your best shot.