Senate Majority Leader Mitch McConnellMitch McConnellBorder-adjustment tax proposal at death’s door McConnell on Trump: 'We could do with a little less drama' New CBO score triggers backlash MORE (R-Ky.) has announced the Senate will begin voting to approve the Keystone XL oil pipeline on Monday.

“It is my hope that Chairman [Lisa] Murkowski [R-Alaska] and Sen. [Maria] Cantwell [D-Wash.] can begin the amendment process under regular order,” he told colleagues from the floor.

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The Senate must first vote to end a Democratic filibuster on the motion to begin consideration of the pipeline project.

“Unfortunately, some of our colleagues on the other side of the aisle continue to block our effort to even get on the bill, and therefore the cloture vote on Monday is required,” McConnell said.

In the last Congress, Senate Democratic Leader Harry ReidHarry ReidThis week: Congress awaits Comey testimony Will Republicans grow a spine and restore democracy? Racial representation: A solution to inequality in the People’s House MORE (Nev.) would retaliate against Republican filibusters by denying colleagues the chance to offer amendments through a procedure known as “filling the tree.”

McConnell has pledged to give Republicans and Democrats alike a free hand to offer amendments to Keystone, which could stretch the floor debate until late January.