Sen. Marco RubioMarco Antonio RubioOvernight Cybersecurity: What we learned from Carter Page's House Intel testimony | House to mark up foreign intel reform law | FBI can't access Texas shooter's phone | Sessions to testify at hearing amid Russia scrutiny Cornyn: Senate GOP tax plan to be released Thursday This week: GOP seeks to advance tax overhaul 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 TrumpDems win from coast to coast Falwell after Gillespie loss: 'DC should annex' Northern Virginia Dems see gains in Virginia's House of Delegates MORE and Sen. Ted CruzRafael (Ted) Edward CruzOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP criticism of tax bill grows, but few ready to vote against it Anti-gay marriage county clerk Kim Davis to seek reelection in Kentucky 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) SandersWorld leaders reach agreement on trade deal without United States: report Sanders on Brazile revelations: DNC needs ‘far more transparency’ Sen. Warren sold out the DNC MORE (I-Vt.), who's running for the Democratic nomination, has missed 36.