DHS reportedly requests more troops at border to upgrade fencing

More U.S. troops might be deployed to the U.S.-Mexico border to upgrade 160 miles of fencing.

Three unnamed U.S. officials told NBC News the Department of Homeland Security made the request for additional troops to Acting Secretary of Defense Patrick Shanahan.

Now, the Department of Defense is not affected by the partial government shutdown, and the cost of any fence construction would reportedly come out of the Pentagon's annual budget. 

The Trump administration announced plans to deploy thousands of active-duty troops to the border back in late October, in response to migrants who were traveling north through Mexico at the time.

Those troops have been supporting U.S. Customs and Border Protection efforts by helping with surveillance, reinforcing barriers, and providing medical support and temporary housing.

President Donald trump's border wall prototypes:

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President Donald Trump's border wall prototypes
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President Donald Trump's border wall prototypes
A border patrol officer stands next to some of U.S. President Donald Trump's eight border wall prototypes as they near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
Federal agents patrol next to U.S. President Donald Trump's eight border wall prototypes as they near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
One of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
Seven of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
One of U.S. President Donald Trump's eight border wall prototypes is pictured along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
Two of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border near San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
A prototype for U.S. President Donald Trump's border wall with Mexico is seen behind the current border fence in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes
A prototype for U.S. President Donald Trump's border wall with Mexico is seen in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes
Prototypes for U.S. President Donald Trump's border wall with Mexico are shown near completion behind the current border fence, in this picture taken from the Mexican side of the border, in Tijuana, Mexico, October 23, 2017. REUTERS/Jorge Duenes
Three of U.S. President Donald Trump's eight border wall prototypes are shown near completion along U.S.- Mexico border in San Diego, California, U.S., October 23, 2017. REUTERS/Mike Blake
A prototype for U.S. President Donald Trump's border wall with Mexico is shown in this picture taken from the Mexican side of the border, in Tijuana, Mexico, October 23, 2017. REUTERS/Jorge Duenes
Prototypes for U.S. President Donald Trump's border wall with Mexico are shown near completion in this picture taken from the Mexican side of the border, in Tijuana, Mexico, October 23, 2017. REUTERS/Jorge Duenes
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes TPX IMAGES OF THE DAY
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
People (R) work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
People work in San Diego, California, U.S., at the construction site of prototypes for U.S. President Donald Trump's border wall with Mexico, in this picture taken from the Mexican side of the border in Tijuana, Mexico October 3, 2017. REUTERS/Jorge Duenes
Prototypes for U.S. President Donald Trump's border wall with Mexico are seen behind the current border fence in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes TPX IMAGES OF THE DAY
Prototypes for U.S. President Donald Trump's border wall with Mexico are seen behind the current border fence in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes
A prototype for U.S. President Donald Trump's border wall with Mexico is seen in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes
A prototype for U.S. President Donald Trump's border wall with Mexico is seen in this picture taken from the Mexican side of the border in Tijuana, Mexico October 12, 2017. REUTERS/Jorge Duenes
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Now some of those troops have reportedly come home, but the roughly 2,300 who are still at the southern border are scheduled to remain there until the end of January.

NBC News' sources say this recent DHS request could extend the mission through September, though. It would be up to the Pentagon to decide if the troops it deploys are active-duty or members of the National Guard.

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