WASHINGTON (AP) — NBC has asked GOP presidential candidate Mitt Romney to pull a television ad that's made up almost entirely of a 1997 "Nightly News" report on Newt Gingrich's ethics committee reprimand. ......NBC spokeswoman Lauren Kapp says the network's legal department has asked the campaign to remove all NBC News material from its ads. Brokaw says he's "extremely uncomfortable with the extended use" of his image. Romney spokesman Rick Gorka says the campaign hasn't received formal notification from NBC and had no immediate comment.