Biden will hold a series of meetings with key Democrats Wednesday, including Pelosi and Senate Majority Leader Chuck Schumer as party leaders try to salvage their two-part domestic agenda — a massive social safety net expansion and bipartisan infrastructure bill — amid a fresh round of hostage-taking from centrist and progressive members.

“I hope he is the secret sauce,” House Majority Leader Steny Hoyer said of Biden. “The president of the United States is always a very influential figure, and I know he wants both bills passed.”…

Meanwhile, moderates — even beyond the group of nine that halted floor action last month — are vowing mutiny if the left does upend the infrastructure bill Biden embraced as a signature achievement, especially after Pelosi promised them a vote by Monday in an agreement that salvaged the dual-track domestic plan last month.

“It would be deeply disappointing to have the bill on the floor only to have people … vote against it for political grandstanding,” said Rep. Stephanie Murphy (D-Fla.), one of the nine centrists who struck that deal to set up Monday’s infrastructure vote.