Sen. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (R-Fla.) returned to the Senate on Thursday, two days after ending his presidential campaign. 

Alex Burgos, a spokesman for Rubio, posted a video of the senator walking in the Russell Senate Office Building, saying that "Senate staff welcomed him back to the office."

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The video shows Rubio's staff clapping as he walked toward his office. 

Rubio ended his presidential campaign on Tuesday evening after losing the primary in his home state of Florida. He trailed in national polls behind businessman Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE and Sen. Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE (R-Texas), who have ridden voter frustration with Washington to the top of the GOP field.

Burgos told The Hill that Rubio participated in a Foreign Relations Committee hearing on Thursday and will be at the Senate's vote later in the day on holding Backpage.com in contempt.

That would mark the fourth time Rubio has voted in the Senate this year, where he's missed 34 of 37 roll call votes, according to GovTrack.  

Rubio's office repeatedly defended his voting record, which came under attack during the campaign, saying he returned to Washington for important votes or when his vote made a difference in the outcome.  

Rubio isn't the only presidential candidate who missed votes as the White House race hit high gear. Cruz has missed 35 of the Senate's 37 roll call votes so far this year, and Sen. Bernie SandersBernard (Bernie) SandersOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Dems fear lasting damage from Clinton-Sanders fight MORE (I-Vt.), who's running for the Democratic nomination, has missed 36.