The open-wheel race is the latest of President Trump's celebrations this year to mark America's 250th birthday.
The president took a ceremonial lap of the track before the race, which is the culmination of a summer of events to mark the country's 250th birthday.
Surrey, Essex, Somerset and The Blaze make Finals Day at Old Trafford next Saturday after winning their quarter-finals.
Donald Trump says Washington's first IndyCar race spent years stuck in neutral ... until he got involved and helped get the green light in about 15 minutes. The president joined FOX Sports at Sunday's Freedom 250 Grand Prix in D.
Author David J. Kramer argues that the Trump administration must consistently defend American corporate interests and global market stability by increasing pressure on Russia to end its aggression against Ukraine.
Democrats are currently favored to win a majority in the House of Representatives after November's elections.