Senate Majority Leader Harry ReidHarry Mason ReidDems search for winning playbook Dems face hard choice for State of the Union response The Memo: Immigration battle tests activists’ muscle MORE (D-Nev.) on Monday blasted Republicans for holding "hostage" an energy efficiency bill.

Reid said GOP demands for votes on five amendments to the bill threatened to prevent the Senate from functioning.

"The Shaheen-Portman bill is a chance for a fresh start for the Senate, really a new beginning," Reid said in remarks opening the Senate for the week. "But the implications of this legislation extend far beyond energy efficiency. It goes to the integrity of this Senate that we care so much about."

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"They've held this bill hostage," Reid said. "Demand after demand has been meet. But even now, they're still seeking a ransom."

The Senate will vote at 5:30 p.m. Monday on whether to end debate on the energy efficiency bill. Sixty votes are needed to advance the legislation to a final passage vote.

Reid has offered to allow a vote on legislation to authorize the construction of the Keystone XL oil pipeline if the Senate passes an energy efficiency bill from Sens. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenSupreme Court to hear online sales tax case State official indicates US military role in Syria post-ISIS centered on Iran Overnight Health Care: Dems press HHS pick on drug prices | Alexander, Trump discuss ObamaCare fix | Senate Dems seek B to fight opioids | Maryland eyes ObamaCare mandate replacement MORE (D-N.H.) and Rob PortmanRobert (Rob) Jones PortmanFlake's anti-Trump speech will make a lot of noise, but not much sense Top GOP candidate drops out of Ohio Senate race Overnight Tech: Regulators to look at trading in bitcoin futures | Computer chip flaws present new security problem | Zuckerberg vows to improve Facebook in 2018 MORE (R-Ohio). But Senate Minority 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.) has said his caucus won't cede a filibuster unless the GOP gets votes on at least five amendments.

Reid said that Republicans kept changing the goalposts for an agreement on passing the energy efficiency bill, which was also unable to clear a filibuster hurdle last September.

"Democrats have acted in good faith and we've bent over backwards to make this bill work," Reid said. "But it seems our efforts are never enough. Each concession we make brings new demands."

Reid argued that Republicans' changing demands for the energy efficiency bill illustrated Senate dysfunction.

"Look at how Republican obstruction is bringing the Senate to its knees again and again and again," Reid said. "This useless, mind-boggling obstruction is what continually the grinds the wheels of the Senate to a screeching halt."