The Pentagon rejected a request from the White House last month to allow U.S. troops to perform emergency law enforcement tasks along the U.S.-Mexico border, CNN reported on Friday.

Two unnamed Defense Department officials familiar with the request told CNN that the White House requested a reserve force authorized to provide "crowd and traffic control" to areas along the border and to protect Border Patrol personnel ahead of the arrival of thousands of migrants preparing to apply for asylum in the U.S.

But on Oct. 26, the Pentagon rejected the request, according to CNN, because the Defense Department felt that the tasks fell outside the scope of active duty soldiers' authority.

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Officials at the White House did not immediately respond to a request for comment from The Hill, while a Pentagon spokeswoman declined to comment on the issue when reached by email.

News of the White House's request comes despite assurances from Defense officials that any troops deployed to the border would not come into contact with a caravan of migrants currently headed to the U.S. southern border, and would only support local law enforcement personnel.

The Defense Department on Monday announced the deployment of more than 5,000 active-duty service members to the southern U.S. border, which joined nearly 2,100 National Guardsmen already stationed at the border to assist Homeland Security personnel.

“By the end of this week will we deploy over 5,200 soldiers to the southwest border. That is just the start of this operation; we’ll continue to adjust the numbers and inform you of those,” a spokesman said.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE said later in the week that he could deploy as many as 15,000 troops to the border in total, which would equal more total service members than the U.S. currently has stationed in Afghanistan.

"As far as the caravan is concerned, our military is out. We have about 5,000. We'll go up to anywhere between 10 and 15,000 military personnel on top of Border Patrol, [Immigration and Customs Enforcement] and everybody else at the border," he told reporters at the White House just two days after the announced deployment of 5,200 troops.

"Nobody is coming in. We're not allowing people to come in," he added.

--Updated at 8:11 p.m.