Fox News host Tucker Carlson said Monday that Mexico had been more successful than Russia in influencing U.S. elections by "packing" the American electorate with its own people.

Carlson said Russia has, in fact, sought to meddle in U.S. affairs. But other countries, like Mexico, had been more successful in doing so, he said.

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"I don’t think Russia is our close friend or anything like that," Carlson said. "I think of course they try to interfere in our affairs. They have for a long time. Many countries do. Some more successfully than Russia, like Mexico, which is routinely interfering in our elections by packing our electorate."

Carlson's remarks came after Trump, during a joint news conference with Russian President Vladimir Putin on Monday, cast doubt on the U.S. intelligence community's determination that Russia meddled in the 2016 election.

"They said they think it’s Russia. I have President Putin; he just said it’s not Russia," Trump said, adding that he does not "see any reason why it would be" Russia.