Vermont Sen. Bernie Sanders is concerned that supporters aren’t donating enough money, according to a new email sent from his campaign Tuesday afternoon.

“The bad news is, our average donation amount is far less than anyone else. This month our average donation is lower than it’s ever been — right around $14,” the socialist 2020 candidate wrote. “That means it takes 200 donations to match 1 max-out check being scooped up at a swanky fundraiser held by one of our opponents.”