President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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.