Susan Rice National Security Advisor Nomination; Michelle Obama Faces Heckler Want to go to abc's jon karl, our chief white house correspondent. We're just learning now that the president's national security adviser tom donnell will be replaced by u.N. Ambassador susan rice, of course, in the middle of that -- all that controversy over benghazi. Reporter: That's right, george. Just a few minutes ago a senior white house official told me that donilon is out and susan rice is in. This will be something that will capture the attention of republicans. Susan rice, of course, as you mentioned was the one that went on the sunday shows right after the attack in benghazi and talked about it being something that came out of protests in cairo, very controversial set of sunday show appearances. Republicans don't like her very much. Now close to the president and she will be his national security adviser. Been with him right from the start of his presidential campaign. The president looked at her for a possible pick as secretary of state and she will be a hard-nose national security adviser. Reporter: She is a no-nonsense adviser. As you mentioned one of the very first foreign policy advisers on the president's campaign, close to him even before he officially launched the campaign. She is tough. She is no nonsense and, frankly, she was early indications the person the president wanted to put over as secretary of state. Republicans made it clear they would do everything they could to block that. As national security adviser she does not need senate confirmation, the president is free to choose whoever he wants. Speaking of no nonsense michelle obama, private fund-raiser at a home in washington, d.C. Confronted by a gay rights activist and she was dr. Ing none of it. One of the things -- one of the things that I don't do well is this. Jon, right after that she walked right up to the heckler and went toe to toe. Reporter: This is something else, george. The heckler told us afterwards she felt like the first lady was just a few inches away from her face. What happened is she came down from the podium approached the heckler and said, you could hear a little in the tape, one of the things I don't do well is this. Listen to me or you can take the mike but I'm leaving. George, the crowd loved it. They started applauding. The heckler was removed and the first lady went on with her speech.