The House minority leader is among President Obama’s strongest backers on Capitol Hill, but liberals in her caucus — still resentful of the North American Free Trade Agreement (NAFTA) they say failed to meet its promise of helping U.S. workers — are lining up in opposition to Obama’s call for fast-track trade authority.

Fast-track would pave the way to the Trans-Pacific Partnership (TPP) with 11 other nations, which is a central part of Obama’s “pivot” to Asia.

Pelosi (D-Calif.) has said repeatedly that she’s seeking “a path to yes” on the sweeping trade deal, but the full-throated opposition from liberals puts her in a tough spot.

Pelosi, along with her entire leadership team, has remained uncommitted on the fast-track legislation, adopting Obama’s advice that Democrats hold their critiques in the early stages of the debate. Publicly, she says she’s still reviewing the bill.

“If you say ‘no’ from the get-go, then you can’t improve the product,” said a Democratic aide familiar with Pelosi’s behind-the-scenes message to Democrats.