Senate Republicans are pushing work on their tax bill into Friday as they try to address concerns over the deficit.

"For the information of all senators, the Senate will continue to debate the bill tonight. The next roll call votes will be at 11 a.m. tomorrow morning," Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSessions: 'We should be like Canada' in how we take in immigrants NSA spying program overcomes key Senate hurdle Overnight Finance: Lawmakers see shutdown odds rising | Trump calls for looser rules for bank loans | Consumer bureau moves to revise payday lending rule | Trump warns China on trade deficit MORE (R-Ky.) announced Thursday night.

The decision to skip a late-night session on Thursday comes as deficit hawks, led by Sen. Bob CorkerRobert (Bob) Phillips CorkerSenate campaign fundraising reports roll in Congress should take the lead on reworking a successful Iran deal North Korea tensions ease ahead of Winter Olympics MORE (R-Tenn.), push for a guarantee that the Senate tax legislation won't significantly increase the deficit.

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They had demanded the inclusion of a "trigger" but were told by the Senate parliamentarian on Thursday that it didn't comply with the Senate rules.

That resulted in a dramatic scene on the Senate floor as leadership and lawmakers discussed an automatic tax increase as an alternative for the trigger.

Though Republicans argue economic growth will cover the $1.4 trillion cost of their bill, an analysis released on Thursday found that it would still cost roughly a $1 trillion over a decade.

The eleventh-hour scramble to work out a deal on the deficit made it appear increasingly unlikely that Republicans would be able to pass their tax bill on Thursday night. 

Though debate time didn't technically expire until early Friday morning, leadership had hoped to be able to get an agreement to start the freewheeling floor marathon, known as vote-a-rama, and pass the bill late Thursday.

But GOP senators appeared increasingly skeptical as the night wore on that the timeline was still feasible. 

"My expectation is tomorrow," Sen. Johnny IsaksonJohn (Johnny) Hardy Isakson'Apprentice' winner Randal Pinkett on Trump: 'No question in my mind he’s a racist' GOP senator: Trump 'owes the people of Haiti and all of mankind an apology' Reforming veterans health care for all generations of veterans MORE (R-Ga.) told reporters shortly before the announcement. 

Sen. John KennedyJohn Neely KennedyMORE (R-La.) also predicted that votes would be pushed until Friday.

"If I were a betting man, I'd say no," he said when asked about a Thursday finish.