The Senate is poised to hold a rare Sunday session as a bipartisan group of lawmakers try to finish up the text of their infrastructure bill.

Instead, Senate Majority Leader Charles SchumerChuck SchumerSenate infrastructure talks spill over into rare Sunday session Senate holds sleepy Saturday session as negotiators finalize infrastructure deal An August ultimatum: No recess until redistricting reform is done MORE (D-N.Y.) announced late Saturday night that the bill won't be ready until Sunday.

The slip into Sunday is the latest delay for the bipartisan legislation, with negotiators meeting around-the-clock to try to finalize their deal.

The group joined President BidenJoe BidenThe Supreme Court and blind partisanship ended the illusion of independent agencies Missed debt ceiling deadline kicks off high-stakes fight Senate infrastructure talks spill over into rare Sunday session MORE at the White House more than a month ago to announce that they had a deal on a framework for $1.2 trillion over eight years.

Mark WarnerMark Robert WarnerSenate infrastructure talks spill over into rare Sunday session Senate holds sleepy Saturday session as negotiators finalize infrastructure deal Democrats warn shrinking Biden's spending plan could backfire MORE (D-Va.), a member of the bipartisan group, said on Saturday that they were still finishing up the "last couple pieces of legislative language.".

Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenSenate infrastructure talks spill over into rare Sunday session Senate holds sleepy Saturday session as negotiators finalize infrastructure deal Overnight Defense: First group of Afghan evacuees arrives in Virginia | Biden signs Capitol security funding bill, reimbursing Guard | Pentagon raises health protection level weeks after lowering it MORE (D-N.H.), Kyrsten SinemaKyrsten SinemaSenate infrastructure talks spill over into rare Sunday session Senate holds sleepy Saturday session as negotiators finalize infrastructure deal On The Money: Justice Department says Trump's tax returns should be released | Democrats fall short of votes for extending eviction ban MORE (D-Ariz.) and Jon TesterJonathan (Jon) TesterSenate infrastructure talks spill over into rare Sunday session Senate holds sleepy Saturday session as negotiators finalize infrastructure deal Democrats say they have the votes to advance .5T budget measure MORE (D-Mont,), who are four out of the five core Democratic negotiators, were spotted huddling around the Capitol and meeting with Schumer on Saturday.