ST. LOUIS — A key member of the city-county merger initiative has quit its board, citing “major reservations” about the future of the organization and calling for the resignation of three top officials.

Better Together Vice Chairman Will Ross, associate dean for diversity at Washington University School of Medicine, said he worries that the nonprofit is planning to take its existing proposal and “repurpose it,” without community input.

“I don’t have the confidence that the same people at the table can do this and be trusted,” Ross said. “At this point, when we’ve had such an abysmal — and I use that word correctly — such an abysmal response from the public, I think it’s time for a complete restructuring.”

Ross’ comments come before a Better Together board meeting scheduled for Thursday. Other trustees did not on Tuesday echo his concerns. They did, however, say that they expect to contemplate the organization’s future at the meeting.

“I’m sure there will be a great deal of discussion,” said trustee Jeff Aboussie, a former union official and current lobbyist. “I think this is a very, very delicate and important decision that all of us have to make, in this whole region.”