Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) said in an interview broadcast Sunday that Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s plan to build a wall across the U.S. border with Mexico isn’t “advisable.”

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Speaking with John Catsimatidis in a radio interview, Flake was asked whether Trump, the presumptive GOP presidential nominee, is right to be alarmed about border security.

“To think that we’d have a wall like Donald Trump is talking about across our 225-mile border with Mexico from California to Texas isn’t very feasible, or advisable,” he said.

But there are still concerns about the border, Flake said, admitting he is concerned about drug trafficking and the possibility of terrorists coming across from Mexico.

Flake argued the federal government hasn’t done enough to secure the border and Arizona is paying the price.

“Certainly we need better border security,” he said. “We have about a 750-mile border in Arizona with Mexico and we bear the brunt of the federal government’s failure to have a secure border.”

Flake has been a vocal critic of his party’s likely presidential nominee.

Last month he said he “can’t see [himself] voting for Donald Trump.”