President-elect Donald TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE told MSNBC host Mika Brzezinski that he's fine with a nuclear arms race developing, Brzezinski said Friday morning.

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The "Morning Joe" co-host said Trump privately told her he is confident that the U.S. can “outlast” any other country.

“Let it be an arms race, we will outmatch them at every pass ... and outlast them all,” Brzezinski recounted Trump saying.

Transition officials did not immediately respond to requests to confirm the report.

Co-host Joe Scarborough said that Brzezinski was hoping to get clarification about Trump’s tweet from Thursday in which he said that the U.S. should “strengthen and expand” its nuclear capabilities.