As political fault lines continue to undermine the struggling Edgartown library rebuilding project, the town selectmen have called a special meeting for Monday afternoon to address the problems.

The meeting will be held at 3:30 p.m. prior to the weekly selectmen’s meeting.

“This committee has been making bad decisions for six years,” declared Edgartown selectman Michael Donaroma, also a member of the library building committee, following a tense meeting with elected library trustees on Tuesday night.

Building committee members attended the meeting seeking a vote of confidence to endorse the idea of building a new library at the site of the old Edgartown School, but came away disappointed.

Trustees said they need more information before they can support relocating the library from its longtime home in the Carnegie building on North Water street.

“There’s no reason to have to make a decision today,” library trustee and chairman Pat Rose said. “We have until it’s time to sign the grant {Jan. 27] and we could have a special meeting. At this point we don’t have all the information,” she added.

“I don’t see what will change between this week . . . and April,” Mr. Donaroma replied. “This committee needs to build consensus. The work that we’ve done to this point is all for naught if we can’t get the trustees on board tonight. You’re the key to this whole thing.” He continued:

“We’ve come to you with a plan for a new library. If you can’t stand behind the concept of moving and trying to put together a library, that’s all we’re asking for. A no vote is a signal loud and clear, at least to me.”

The decision to return to the old school site followed a ruling last month by the historic district commission that the Warren House which abuts the Carnegie building could not be torn down to make way for a large parking lot and library addition.

But on Tuesday night the library trustees balked at the latest decision by the building committee.

“I could not vote for this motion given the amount of information that is here and not here,” trustee Ellen Kap-lan said, voicing concerns about the cost of the project.

Ms. Rose questioned why the building committee could not reach an agreement to stay at the Carnegie building.

Committee vice chairman Carl Watt replied that state grant money hangs in the balance. “You’re being extremely shortsighted,” Mr. Watt said. “You’re saying the important thing is to stay at the Carnegie library. The state doesn’t say that. If you vote not to support it . . . the grant is dead and you’re stuck with what you have here.”

Trustees also expressed their concerns about the future of the Carnegie building if the library moves to the old school.

“When people are talking about preserving the [Warren] House, I don’t hear anyone talking about the importance of preserving this library as a library and the importance it’s played in this community for 100 years,” Ms. Rose said.

Others back the idea of moving to the old school location, including Edgartown School principal John Stevens and school committee member Leslie Baynes.

“The whole layout looks very exciting to me,” Mr. Stevens said at a Monday meeting of the building committee. “Just the synergy created from a public library next to a public school and the possibility for common use is very exciting.”

Mr. Baynes agreed. “The school committee is thrilled about it, and it makes a good campus there for the community,” he said. “The school committee is willing to work with it and very excited about it. I’d like to think we’d get more kids into the library.”

The trustees took no vote on Tuesday night, although it was clear some supported the building committee’s plan.

“As an old Brooklyn Dodger fan, it took me 50 years until I started rooting for Boston [Red Sox],” Mr. Foster said. “I’m accepting the cost and I’m ready to move . . . We’ve tried and banged our head against the wall, and if we want a new library we’re going to have to move. Enough already.”

Ned Southworth concurred. “I agree with Herb, I think we’re stuck with this plan,” he said. “It’s time to let go of the Carnegie as a library, trust the town to do something appropriate and nice with it and throw our support behind the move to the Edgartown-West Tisbury Road.”

In addition to the selectmen’s special meeting Monday, a public forum will be held at the Edgartown School on the library project next Wednesday at 6 p.m.