At this point, a vote is still possible on an amendment from Sen. Rand PaulRandal (Rand) Howard PaulHouse bill set to reignite debate on warrantless surveillance Authorizing military force is necessary, but insufficient GOP feuds with outside group over analysis of tax framework MORE (R-Ky.) to extend the debt ceiling in line with the Obama administration's budget proposal (which Paul and other Republicans hope will fail). A vote may also happen on one from Sen. Jim DeMint (R-S.C.) that would repeal last year's Dodd-Frank law.

Both of these amendments had "pending" status on Thursday.

Others introduced mid-week (mostly from Republicans) have a less certain fate. Among other things, they would require the completion of the border control fence along the southern U.S. border, repeal some of the Federal Reserve's newfound authority under Dodd-Frank to supervise banks, set up a new congressional review procedure for questionable regulations, and even one to exempt "lesser prairie chicken" from the endangered species list.

The strong feelings Republicans have about their right to bring up amendments became evident at one point on Thursday when Sen. John McCainJohn Sidney McCainRubio asks Army to kick out West Point grad with pro-communist posts The VA's woes cannot be pinned on any singular administration Overnight Defense: Mattis offers support for Iran deal | McCain blocks nominees over Afghanistan strategy | Trump, Tillerson spilt raises new questions about N. Korea policy MORE (R-Ariz.) thought one of his amendments was about to be blocked. His amendment would prohibit federal funds from being used to fund the construction of ethanol storage facilities or ethanol blending pumps.

"I understand the strength of the ethanol lobby, but there was an agreement that amendments could be called up," McCain said. "If that is not the case, I would obviously have to start with other parliamentary measures.”

McCain was allowed to offer his amendment.

Republicans, led by DeMint earlier in the week, assured that right to with a threaten to block the bill from coming to the floor if a deal struck by Senate leadership in January affording unlimited amendments to most legislation was not adhered to by Democratic leadership.

DeMint dropped his threat on Tuesday once he received assurances from the majority that the open amendment process would be followed.

The Senate adjourned at around 7:40 p.m. on Thursday and is set to return on Monday at 2 p.m.