President Joe Biden, who often says he’s the most pro-union president in history, touted the importance of unions and applauded American workers in building the economy during a Labor Day appearance in Philadelphia on Monday.

The Democratic president spoke about how the economy is recovering from the crippling coronavirus pandemic and about what his administration has done to pay for infrastructure improvements, and he cited the importance of unions in building the middle class.

“This Labor Day we’re celebrating jobs, good-paying jobs, jobs you can raise a family on, union jobs,” Biden told the crowd gathered Monday. Instead of standing at the podium, the president held the microphone in his hand and walked around the stage behind signs that read “UNION STRONG.”