South Bend Mayor Pete Buttigieg is officially running for president in 2020.

He made that announcement in front of about 10,000 people at Studebaker Building 84 Sunday afternoon, which quickly filled up around 1:30. People who didn’t get in were being directed to a different part of the building to watch on a screen.

He hopes to become the first openly gay and youngest U.S. President. He is also a veteran who served in Afghanistan.

Buttigieg called “Make America Great Again” a myth being told to rural and industrial areas by President Trump, because it was never really great to begin with. Buttigieg told the crowd that politics in the U.S. feels confusing because “we’re on a blank page where things are ready to change.”