On Sunday morning, the co-hosts of MSNBC’s “The Weekend” laughed at Donald Trump running mate Sen. J.D Vance after watching a “Meet the Press” clip of him walking back comments he made and admitting he’s not speaking for the former president. In the full interview with Vance, to be broadcast later on Sunday, the Ohio Republican was pressed on his claims about Trump signing a national abortion ban, and told host Kristen Welker, “I think I’ve learned my lesson and speaking for the president before he and I talked about an issue. What he said at the debate as he doesn’t support a national ban. He…