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Tucker Carlson said President Trump must be wary of alienating his core supporters through "betrayal" of his campaign platform.

He noted that Trump supporters put up with derision from the press, the left and others on a day-to-day basis, but still stick with the New York Republican.

"The ideas the president ran on are basically right," he said. "'America First' ought to be the operating principle of every administration - by definition."

He said the non-Trump alternative - the Democratic Party - is "scary" and "completely irresponsible."

But, Carlson warned that Trump's pointed remarks on gun control during a White House meeting rightfully caused concern among much of his base.

He pointed out how Trump verbally criticized Sen. Pat Toomey (R-Pa.) as possibly being afraid to act on gun control because of the NRA's political power.

Trump then said that in important cases, government should "take the guns first, then go through due process."

"Imagine if Barack Obama had said that," Carlson said, noting that it would immediately elicit calls for impeachment and secession on the right.

He reminded Trump that the due process is a constitutional right just as much as the right to keep and bear arms is.

Carlson added that his base could splinter during the midterms, and vote for the Democrat "alternative" if they choose.

Watch more above.

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