Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE is surprised at comments Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE has made about him recently, he told Fox News's Howard Kurtz.

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"I'm so surprised at Mitch," Trump said. "You'd think he'd be very positive. I always thought I had a good relationship with Mitch, but perhaps I don't."

The Kentucky Republican has chastised Trump for his proposal to temporarily ban Muslims from entering the country and said it's "obvious" he doesn't know "a lot about the issues."

"He needs someone highly experienced and very knowledgeable because it's pretty obvious he doesn't know a lot about the issues," McConnell said of a running mate for Trump.

He wouldn’t rule out rescinding his endorsement of the presumptive Republican presidential nominee either.

"I'm not going to speculate about what he might say or what I might do. But I think it's pretty clear. I've been very clear publicly about how I think he ought to change directions, and I hope that's what we're going to see," McConnell told The New York Times.

McConnell tepidly endorsed Trump in May, saying, like many who are unsure about the unconventional candidate, that he was committed to "supporting the nominee chosen by Republican voters."

McConnell's comments highlight the unease between Trump and Republican leaders.

But, while Trump has said "it would be nice" if the Republican Party gets behind him, he is prepared to go it alone if necessary.

"I think that I win either way," Trump told NBC's "Meet the Press" in an interview aired Sunday. "I can win one way or the other."