Keystone marathon begins in Senate

The Senate on Tuesday began what is expected to be a weeks-long debate over the Keystone XL pipeline by holding a trio of amendment votes.

Out of the three amendments proposed, only one — Republican Sen. Rob PortmanRobert (Rob) Jones PortmanWhere do we go from here? Conservation can show the way GOP senators offering bill to cement business provision in Trump tax law Mnuchin defends Treasury regulations on GOP tax law MORE's (Ohio) trimmed down version of an energy efficiency bill — passed, in a 95-4 vote.

Two other amendments proposed by Democrats — one that would have banned the export of oil shipped through the Canada-to-Texas pipeline and another that would have required the project be built with U.S. steel — were killed by the Senate.

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Sen. Ed MarkeyEdward (Ed) John MarkeyKennedy, Markey neck-and-neck in Massachusetts primary: poll Overnight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development MORE (D-Mass.) slammed Republicans, claiming they "blocked" his amendment on oil exports and used a procedural move to “table” the amendment and halt debate.

Republicans shot back that a motion to table simply means the Senate as a whole doesn't think the amendment should get a vote.

The confusion pointed to the difficulty senators might have in transitioning back to “regular order,” where legislation is amended on the floor. Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellWhere do we go from here? Conservation can show the way Russian interference reports rock Capitol Hill Top GOP super PAC spent money on NC Democrat MORE (R-Ky.) has vowed to allow an open amendment process for the Keystone bill to give members more input.

Sen. Joe ManchinJoseph (Joe) ManchinWhere do we go from here? Conservation can show the way Lawmakers push back at Trump's Pentagon funding grab for wall Overnight Health Care: Appeals court strikes down Medicaid work requirements | Pelosi's staff huddles with aides on surprise billing | Senate Dems pressure Trump to drop ObamaCare lawsuit MORE (D-W.Va.), a co-sponsor of the underlying Keystone bill, said he didn't mind having votes to table amendments.

"It is the first time we have got to vote very much since I have been here in four years, so the vote to table something is a vote," Manchin told reporters.

Senators on Tuesday agreed to take up another six amendments, with votes set to begin Wednesday.

Democrats offered two climate change-related amendments. One of them, from Sen. Brian Schatz (D-Hawaii), says climate change is real and significantly caused by humans. The second, from Sen. Sheldon WhitehouseSheldon WhitehouseDemocratic senators ask DOJ watchdog to expand Giuliani probe Democrats pan Trump's budget proposal as 'dead on arrival' Trump unveils .8 trillion budget that backtracks on deal with Congress MORE (D-R.I.), simply states that,“"climate change is real and not a hoax."

Schatz said the amendments are about "laying down a predicate that asks people what side of basic science and facts they are on."

Republicans are broadly skeptical of the scientific consensus on climate change, arguing the extent to which it is caused by human activity is overstated.

Democrats in response have taken to labeling the GOP a party of “climate deniers” and say Republicans will pay the price at the ballot box in 2016 for their stance.

"There's an opportunity for a moderate, science-oriented Republican to show some courage, and vote in the way that they know reflects the facts, even if it may cause them difficulty in the primary election," Schatz said.

The next series of votes also includes an amendment offered by Sen. Dick DurbinRichard (Dick) Joseph DurbinOvernight Energy: EPA to regulate 'forever chemicals' in drinking water | Trump budget calls for slashing funds for climate science centers | House Dems urge banks not to fund drilling in Arctic refuge Democratic senators criticize plan that could expand Arctic oil and gas development Democratic senators ask DOJ watchdog to expand Giuliani probe MORE (D-Ill.) on the transportation of petroleum coke.

Also added to the queue were three Republican amendments: One, from Sen. Deb FischerDebra (Deb) Strobel FischerLoeffler works to gain traction with conservatives amid Collins primary bid Bolton upends Trump impeachment trial  The Hill's Morning Report — Impeachment unknowns await returning lawmakers MORE (R-Neb.), would limit the designation of new national monuments. Another, from Sen. Mike LeeMichael (Mike) Shumway LeeThe Hill's Morning Report — AG Barr, GOP senators try to rein Trump in Overnight Defense: Senate votes to rein in Trump war powers on Iran | Pentagon shifting .8B to border wall | US, Taliban negotiate seven-day 'reduction in violence' The 8 Republicans who voted to curb Trump's Iran war powers MORE (R-Utah), would restrict fees paid to plaintiffs in endangered species suits. The last amendment, from Sen. Pat Toomey (R-Pa.), deals with coal refuse power plants. 

— This story was updated at 7:25 p.m.