Vice President Pence on Tuesday supported President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's claim without evidence that "unknown Middle Easterners" are traveling with the group of Central American migrants moving north through Mexico toward the U.S.

"Well, it’s inconceivable that there are not people of Middle Eastern descent in a crowd of more than 7,000 people advancing toward our border," Pence said in an interview with Washington Post reporter Robert Costa at an event sponsored by newspaper.

Pence went on to say that, "in the last fiscal year, [the U.S.] apprehended more than 10 terrorists or suspected terrorists per day at our southern border from countries that are referred to in the lexicon as other than Mexico — that means from the Middle East region."

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Pence also did not offer evidence to support Trump's claim that people from the Middle East were traveling with the caravan.

The comments came as Trump has escalated his rhetoric toward immigration while a migrant caravan with about 7,500 people fleeing violence in Central America approaches the U.S.-Mexico border.

"Sadly, it looks like Mexico’s Police and Military are unable to stop the Caravan heading to the Southern Border of the United States. Criminals and unknown Middle Easterners are mixed in," Trump tweeted on Monday. "I have alerted Border Patrol and Military that this is a National [Emergency]. Must change laws!"

Trump also said he was ready to cut off or substantially reduce U.S. aid to Guatemala, El Salvador and Honduras for their failure to stop the band of migrants from heading to the U.S.

Trump has repeatedly placed blame on Democrats over issues related to migrants traveling to the border and has frequently called for strengthening immigration laws.

He's consistently said immigration will be a key issue for voters during this year's midterm elections.

“This will be an election of Kavanaugh, the caravan, law and order and common sense,” he said at a campaign rally in Montana last week.

Trump last week warned that he could take military action to stop immigrants from crossing the southern border if Mexico does not take action to stop the "onslaught."