President Trump is the first president to use a declared emergency to wrest control of Washington, D.C.’s police force.

The DC National Guard began appearing in the nation’s capital on Tuesday after President Donald Trump announced a day earlier he is deploying guard troops and placing Washington, DC’s police department “under direct federal control,

The president also said he would consider calling in active-duty military troops if needed, launching an unprecedented effort to take charge of the nation’s capital.