A protester takes a picture while holding a sign that reads “IMPEACH” in downtown Washington following the inauguration of President Donald Trump.

Protesters gather around a fire they built in the street following the inauguration of President Donald Trump.

Police and demonstrators clash in downtown Washington after a limo was set on fire following the inauguration of President Donald Trump.

A trash fire set by anti-Trump protesters burns on K Street in Washington, DC.

A woman attending the inauguration of President Donald Trump clashes with protesters who formed a human chain wall during the inauguration.

Police deploy smoke and pepper grenades during clashes with protesters in northwest Washington.

Police prepare to launch concussion and pepper grenades during clashes with protesters in downtown Washington.

Protesters face off with police in downtown Washington.

People attending the inauguration of Donald Trump in Washington were greeted by protesters shouting and bearing signs Friday morning.

People attending the inauguration of Donald Trump in Washington were greeted by protesters.

People attending the inauguration of President Trump were greeted by protesters.

People attending the inauguration of President Trump were greeted by protesters.

Protesters burn signs outside the National Press Building on the eve of the presidential inauguration.

Protesters scuffle with police after refusing to vacate the sidewalk in front of the National Press Building ahead of the presidential inauguration.

People hold signs as they listen to speakers at an anti-Trump rally and protest hosted by filmmaker Michael Moore in front of the Trump International Hotel on Thursday in New York.

Police push protesters off the sidewalk in front of the National Press Building in Washington on Thursday.

Protesters stand against a line of police guarding the front of the National Press Building.

Protesters cover their faces after being pepper- sprayed after a scuffle outside the National Press Building on the eve of the presidential inauguration in Washington.