Senate Keystone veto override vote expected Thursday

The Senate will vote Thursday on whether to override President Obama's veto of legislation authorizing the Keystone XL oil sands pipeline.

Don Stewart, spokesman for Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.), said the senator will file cloture on Wednesday to set up the final vote.

"The cloture vote would then likely be Wednesday and the override on Thursday," Stewart said.

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Republican leadership had originally planned to hold the cloture vote Tuesday, and final override vote on Wednesday, but late action on Friday by the House to fund the Department of Homeland Security changed the schedule.

The Senate will have to hold a cloture vote Monday evening on moving to a conference committee with House lawmakers on funding for DHS, pushing back Keystone action by one day.

The cloture vote on Keystone is needed, Stewart said, since Democrats are prepared to filibuster the override. Sixty votes would be necessary to clear the procedural hurdle.

"[T]o overcome the Democrats’ history-making filibuster of the bipartisan override, the Majority Leader will proceed to the President’s veto message this week and file cloture," Stewart said.

Sen. Barbara BoxerBarbara Levy BoxerThe Hill's Morning Report - Presented by Facebook - Biden, Harris launch Trump offensive in first joint appearance Bottom line Polls show big bounce to Biden ahead of Super Tuesday MORE (D-Calif.) shot back at the override push.

"This is a ludicrous idea," Boxer said. "First, they hold the homeland security funding bill hostage to immigration. Now they want to hold the highway bill hostage to big polluting Canadian special interests.”

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The majority of Democrats in the Senate oppose the Canada-to-Texas pipeline, but nine centrist Democrats support it.

That means supporters are likely to win more than the 60 votes needed to overcome procedural hurdles, but they are unlikely to win the 67 votes necessary to override the president's veto. As of Friday, supporters appear to have 63 votes.  

Sen. John HoevenJohn Henry HoevenDavis: The Hall of Shame for GOP senators who remain silent on Donald Trump Bottom line Bipartisan senators seek funding for pork producers forced to euthanize livestock MORE (R-N.D.) told The Hill last week that he was working to get more Democrats on board but that he is also weighing next moves given the likelihood the override effort will fail.

One option is adding Keystone legislation to another bill.

"I think it's more likely we are going to look to something like the highway bill and attaching it there. That's an infrastructure bill, this is about infrastructure. " Hoeven said. "We have strong support in the House. Obviously, we have everybody on our side." 

Opponents are optimistic the override vote will fail and are putting increased pressure on Obama to reject the pipeline outright as soon as possible.

This story was last updated at 2:32 p.m.