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.

The "History Lesson" ad is running in Florida. It shows NBC anchor Tom Brokaw saying that some of Gingrich's House colleagues had raised questions about the then-speaker's "future effectiveness."

Under Brokaw's image is a line that reads "Paid for by Romney for President, Approved by Mitt Romney."

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.