According to a Wednesday morning Senate whip notice, S. 990 will also be the legislative vehicle for the Patriot Act extension. A Tuesday filibuster from Sen. Rand PaulRandal (Rand) Howard PaulCongress must end American support for Saudi war in Yemen Black men get longer prison sentences than white men for same crimes: study Sarah Palin on sexual harassment: 'People know I'm probably packing' so they 'don't mess with me' MORE (R-Ky.) prevented the Senate from taking up the Patriot Act extension by itself.

Instead, the Senate will take up several amendments to S. 990 from Senate Majority Leader Harry ReidHarry ReidVirginia was a wave election, but without real change, the tide will turn again Top Lobbyists 2017: Grass roots Boehner confronted Reid after criticism from Senate floor MORE (D-Nev.) on Wednesday. The key amendment would add to S. 990 the Patriot Act extension language, allowing U.S. intelligence officials to conduct roving wiretaps, access business records, and conduct "lone wolf" surveillance until June 1, 2015.

Reid on Tuesday filed for cloture on the bill, which should allow the Senate to vote on the package on Thursday. Reid's effort was aimed at avoiding Paul's filibuster and amendments to the Patriot Act bill that he wanted to pursue.

Assuming the Senate can pass the bill Thursday, the House would have to quickly act on the same bill in order to avoid having the Patriot Act authorities expire on Friday.

But one possible hurdle to these plans is whether every senator can support the House version, which would only extend the small-business programs for four months. According to a Senate staffer, Senate Small Business Committee Chairwoman Mary LandrieuMary LandrieuYou want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' CNN's Van Jones: O'Keefe Russia 'nothingburger' video 'a hoax' MORE (D-La.) is pushing for at least a six-month extension or more, which could make it hard for the Senate to come to an agreement.


—This story was updated at 10:20 a.m.