The Pentagon announced on Tuesday that Secretary of Defense Lloyd J. Austin III approved a request from the U.S. Capitol Police for 2,300 National Guard troops to remain in Washington, D.C. through May 23, 2021. There are currently 5,200 troops deployed to the Capitol.

On Thursday, the Fox News Channel obtained a copy of a memo written by Gen. Daniel R. Hokanson, chief of the National Guard Bureau, in which he explained why the National Guard “cannot and should not fulfill the Capitol Police’s troop request at this time.”

Hokanson argued that “the National Guard is already over-stretched due to coronavirus constraints, civil disturbances and wildfires. Efforts to date have not secured enough volunteers among supporting states to meet the USCP request of 2,280 soldiers, nor Option B of 1000 soldiers.”

“I am concerned that the continued indefinite nature of this requirement may also impede our ability to man future missions as both adjutants general and guardsmen alike may be skeptical about committing to future endeavors,” he added.

According to Fox, Hokanson’s memo circulated within the White House National Security Council over the past week.

The memo revealed Hokanson’s choice was overruled by Austin, who decided to maintain a presence of 2,280 troops to “continue the support mission” at the Capitol.

Pentagon press secretary John Kirby spoke to reporters on Wednesday.

“[Y]es, the Department of Defense will be funding this as we’ve funded the previous mission, which ends at the end of the week,” he said. “But that’s not how anybody’s looking at this or foisting that on the Capitol Police, that they’re looking at this as free labor.”

Kirby claimed “they have a legitimate need for some capacity assistance in a time which is fairly uncertain right now … [I]t’s not just about the threat environment in a highly polarized, hyper-charged environment that we’re in right now. It is very much about a capacity assistance to the Capitol Police as they begin to flesh out and develop what they’re going to need long term to deal with a new reality on Capitol Hill.”

The price tag for the National Guard troops from January through March is $410 million, and the extension from March through May will cost an additional $111 million, according to The Wall Street Journal.