Sen. Marco RubioMarco RubioSenators introduce new Iran sanctions Senate intel panel has not seen Nunes surveillance documents: lawmakers With no emerging leaders, no clear message, Democrats flounder 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 TrumpFundamentals or euphoria? Both fueled post-election stock surge Freedom Caucus founder: GOP health plan did not meet campaign promises Former US envoy: No good military options against North Korea MORE and Sen. Ted CruzTed CruzHow 'Big Pharma' stifles pharmaceutical innovation AIPAC must reach out to President Trump Under pressure, Dems hold back Gorsuch support 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 SandersBernie SandersSanders will 'absolutely' work with Trump to lower prescription drug costs Sanders says he will introduce 'Medicare for all' bill Sunday shows preview: Aftermath of failed healthcare bill MORE (I-Vt.), who's running for the Democratic nomination, has missed 36.