Scarborough, who long enjoyed a good relationship with Trump that included largely friendly phone interviews before the two had a falling out as Trump clinched the GOP presidential nomination in 2016, did not provide evidence for his claim.

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The MSNBC host said Trump first "pledged his fealty and loyalty" to Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE in December 2015.

“Donald Trump is either an agent of Russia or he’s a useful idiot. Or he’s somewhere in between, we don’t know what it is,” he said.