The U.S. military is preparing for the possible activation of a portion of the DC National Guard to be deployed to Washington, D.C., according to a U.S. official. It’s unclear exactly how many Guardsmen might be activated, as a decision has not yet been made. There are 2,700 personnel in the D.C. National Guard.

The president is due to elaborate on his plans for the city on Monday, with some raising concerns about federal overreach.

The number of Guard who would be assigned is still in flux, the officials say, and most of the troops would likely be pulled from the D.C. National Guard.