A prominent liberal group is warning Democratic leaders that they will lose base supporters over the Democratic Party’s strategies, or lack thereof, in pushing back against President Donald Trump’s administration.

MoveOn, a large progressive organization, wrote in a letter to Senate Minority Leader Chuck Schumer (D-NY) and House Minority Leader Hakeem Jeffries (D-NY) that its members are frustrated by what they view as a lack of urgency and action to oppose the Trump administration. They stressed that the party could be at risk of losing donors if changes are not made.