The Senate is waiting for Sen. Heidi HeitkampMary (Heidi) Kathryn HeitkampOvernight Energy: Trump taps ex-oil lobbyist Bernhardt to lead Interior | Bernhardt slams Obama officials for agency's ethics issues | Head of major green group steps down Trump picks ex-oil lobbyist David Bernhardt for Interior secretary On The Money: Shutdown Day 27 | Trump fires back at Pelosi by canceling her foreign travel | Dems blast 'petty' move | Trump also cancels delegation to Davos | House votes to disapprove of Trump lifting Russia sanction MORE (D-N.D.) to cast the deciding vote on whether to end debate on President Obama’s nominee to head the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).

The Senate started the cloture vote on Todd Jones’ nomination at 2 p.m. on Wednesday. The current vote count stands at 59-40, one vote short of the 60 votes needed to advance the nominee.

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Six Republicans have voted with Democrats to end debate. After more than 30 minutes of pushing from colleagues, Sen. Lisa MurkowskiLisa Ann MurkowskiGOP Sen. Collins says she'll back resolution to block Trump's emergency declaration The Hill's 12:30 Report: Trump escalates fight with NY Times The 10 GOP senators who may break with Trump on emergency MORE (R-Alaska) switched her vote and joined GOP Sens. Susan CollinsSusan Margaret CollinsTexas GOP rep opposes Trump’s use of national emergency to get border wall GOP Sen. Collins says she'll back resolution to block Trump's emergency declaration Talk grows that Trump will fire Dan Coats MORE (Maine), Kelly AyotteKelly Ann AyotteUS, allies must stand in united opposition to Iran’s bad behavior American military superiority will fade without bold national action Five possible successors to Mattis MORE (N.H.), Lindsey GrahamLindsey Olin GrahamFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Overnight Defense: Graham clashed with Pentagon chief over Syria | Talk grows that Trump will fire Coats | Coast Guard officer accused of domestic terrorism plot Graham cursed at acting DOD chief, declaring himself his 'adversary' MORE (S.C.), John McCainJohn Sidney McCainMellman: Where are good faith and integrity? GOP senator says Republicans didn't control Senate when they held majority Pence met with silence after mentioning Trump in Munich speech MORE (Ariz.) and Mark KirkMark Steven KirkThe global reality behind 'local' problems Dems vow swift action on gun reform next year This week: Trump heads to Capitol Hill MORE (Ill.) in voting to advance Jones' nominations.

Heitkamp has missed all of the votes this week because she’s been back in her home state. A spokesperson for Heitkamp said the senator is on her way to Washington and would cast a “yes” vote.

“Sen. Heitkamp is currently on her way to Washington from North Dakota,” the spokesperson said. “If the vote is held open, she would like to be able to cast her vote.”

After cloture is invoked, the Senate is expected to proceed to a final confirmation vote on Jones' around 7 p.m.

Earlier this month, the Senate Judiciary Committee cleared Jones’ nomination on a party line 10-8 vote.

The bureau hasn’t had a leader for seven years. Democrats have complained that Republicans have opposed ATF directors because of opposition from the National Rifle Association.

Ranking member of the Senate Judiciary Committee Chuck GrassleyCharles (Chuck) Ernest GrassleyOvernight Health Care — Presented by National Taxpayers Union — Drug pricing fight centers on insulin | Florida governor working with Trump to import cheaper drugs | Dems blast proposed ObamaCare changes Drug pricing fight centers on insulin On The Money: Smaller tax refunds put GOP on defensive | Dems question IRS on new tax forms | Warren rolls out universal child care proposal | Illinois governor signs bill for minimum wage MORE (R-Iowa) said he wouldn’t support Jones’ nomination because he is accused of “retaliating against a whistle blower.”

“The Senate should not be voting on a nomination when there is an open investigation,” Grassley said ahead of the vote. “To be honest, we don’t know the full story, but there is an open investigation of serious accusations on retaliation against whistle blower activity. … These are serious charges.”