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 McConnellCongress had a good couple of weeks — now let's keep it going McCarthy: 'The Mueller investigation has got to stop' McConnell: Mueller 'ought to wrap it up' 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 CorkerSanford: GOP lawmakers 'running for cover' over fear of Trump tweets Trump’s trusted diplomat faces daunting task with North Korea George Will says Trump doesn’t inspire ‘cult’ in GOP: ‘This is fear’ 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 IsaksonOvernight Finance: Senators introduce bill to curb Trump's tariff authority | McConnell calls it 'exercise in futility' | Kudlow warns WTO won't dictate policy | Mulvaney feud with consumer advocates deepens Senators introduce bill to curb Trump's tariff authority Trump VA pick boosts hopes for reform 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.