WASHINGTON — President Donald Trump and First Lady Melania Trump arrived at the Freedom 250 Grand Prix in Washington, D.C. on Sunday, joining an IndyCar race held as part of the nation's 250th birthday celebrations.

Trump rode in the presidential motorcade around the newly converted IndyCar speedway on the National Mall. Attendees largely cheered as the limousine moved along the track, though some boos were audible.

The race takes place on a track less than 1.7 miles long with seven turns. Flyovers began early Sunday in preparation for the event.

The appearance comes as Trump holds firm on imposing 50 percent tariffs on Canada, reviving past criticisms of the longtime ally after trade talks broke down on Saturday.

Separately, a source told CNN that Jared Kushner, Trump's son-in-law and close adviser, recently met with House Minority Leader Hakeem Jeffries to discuss potential collaboration on key issues.

Attendee Dianna Fisher, visiting from Orlando, Florida, said she was there to show her patriotism. "I love President Trump," Fisher said, adding: "Just to show our patriotism and be a part of this once-in-a-lifetime-250-year event."

The race route passes significant national institutions. The National Gallery of Art and the National Archives Museum sit beside the track. The National Gallery of Art conducted an "extensive vibration study" and implemented safety measures to protect its collections and guests from the high speeds.