The parade, honoring the Army’s long-planned 250th anniversary celebration and coinciding with Trump’s 79th birthday, is set to step off from the Lincoln Memorial under the threat of stormy weather in Washington and protests around the country tied to a turbulent week of immigration enforcement that has involved military deployment in Los Angeles.

Millions are expected to gather in “No Kings” demonstrations in over 1,500 cities on Saturday, the same day the Army will celebrate its 250th anniversary on Trump’s birthday.