Washington, D.C., Mayor Muriel Bowser has requested that the D.C. National Guard be activated indefinitely to respond to migrant buses arriving in the district, according to reports.

The request also seeks permission to use the D.C. Armory, a multipurpose arena located east of the Capitol, as a processing center as more than 150 buses traveling from Arizona and Texas have transported nearly 6,000 migrants to the nation’s capital over the past three months.