Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) said Wednesday that it's unnecessary to send U.S. troops to the southern border to prepare for the arrival of Central American migrants, calling the move ordered by President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE a "stunt."

Flake, who will retire from the Senate in January, was asked on MSNBC's "Morning Joe" what he would tell a soldier deployed to the border wanting to know why they were sent there.

"I think it’s unfortunate that we have the soldiers [at the border]," Flake said. "You can’t call it anything but a stunt here, and it’s unfortunate that they’re going to be away from family during the holidays coming up, and we just don’t know what really for.

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"We don’t know where the caravan, if it makes it north, is going to come," he continued. "I think it could be handled by civilians that we have there in terms of Border patrol and others. So I don’t know what I could tell them other than we shouldn’t be doing this, and this wasn’t an issue that Congress was involved in, it was an executive decision."

"I think it's unfortunate we have soldiers there, and frankly, in Arizona they are stationed in Tucson, about 90 miles from the border." @JeffFlake pic.twitter.com/KybhxR91pI — Morning Joe (@Morning_Joe) November 14, 2018

Trump ordered thousands of troops be sent to the U.S.-Mexico border to defend against the arrival of a so-called caravan of migrants making its way north through Mexico. Some of the group members could arrive at the U.S. border in the coming days, while other migrants are straggling behind and are still hundreds of miles away.

Leading up to the midterm elections, the president painted the group as an imminent threat to national security, regularly sounding the alarm about their arrival on Twitter and at campaign rallies.

Since Election Day last week, Trump has not mentioned the caravan.