Story highlights Christie declared birtherism "done" and said Donald Trump has dropped it

Christie and Pence claimed Trump hasn't raised the issue in this campaign

Washington (CNN) New Jersey Gov. Chris Christie said Sunday Donald Trump's questioning of President Barack Obama's birthplace was "done," arguing falsely that Trump hasn't talked about it for years and had put to rest any remaining questions Friday.

"The birther issue is a done issue. I've said it's a done issue for a long time, and Donald Trump has said it's a done issue now," Christie, a top Trump supporter and the chairman of his transition team, told CNN's Jake Tapper on "State of the Union."

Though Trump had been asked whether he now believes Obama was born in the United States as recently as 2016 and hadn't affirmed that position, Christie refuted Tapper's questioning saying: "It's just not true that he kept it up for five years."

Tapper: "Sure he did."

Christie: "It's simply not true."

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