Pull up a chair: it’s on between two seasoned lawmakers. Newt Gingrich is firing back at House Minority Leader Nancy Pelosi’s claim that she has dirt on him. Pelosi told Talking Points Memo that she served on a House committee that investigated him, and she has “a thousand pages of his stuff.” Gingrich responded Monday afternoon: “I want to thank Speaker Pelosi for what I regard as an early Christmas gift,” he said. “If she suggested that she's going to use material that she developed when she was on the ethics committee, that is a fundamental violation of the rules of the House, and I would hope that members would immediately file charges against her the second she does it.” And to think that the two were chummy in a 2008 ad together when the two urged action on … global warming.