An executive order by President Donald Trump is targeting the Presidio Trust, the federal agency that manages San Francisco's historic and cherished Presidio National Park, calling it "unnecessary."

An executive order from the president also took aim at three independent agencies that promote peace abroad and work on development in Latin American and Africa.

At an event in San Francisco on Thursday, Pelosi described the 30-year-old legislation that created the Presidio Trust as being intentionally designed to insulate it from future attacks like Trump’s.