Washington (CNN) A day after he fired national security adviser Michael Flynn, President Donald Trump told then-New Jersey Gov. Chris Christie it would end the "Russia thing," according to The New York Times.

The Times' account of Christie's new book said the former Republican governor and his wife had lunch with Trump and Jared Kushner a day after Flynn left the White House following revelations about his communications with Russia.

"This Russia thing is all over now, because I fired Flynn," Trump said, according to Christie's book.

Christie said he laughed and insisted the issue was "far from over."

"What do you mean?" Trump responded. "Flynn met with the Russians. That was the problem. I fired Flynn. It's over."

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