Sen. Marco Rubio Marco Antonio RubioHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Fla.) is back in the spotlight, with lawmakers in both parties wondering whether he’ll break with Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and vote against the president-elect's pick to lead the State Department.

If Rubio votes against Rex Tillerson in the Foreign Relations Committee, it would prevent the GOP from moving the nomination to the floor with a favorable recommendation.

That risks a confrontation with Trump, who disparaged Rubio in the most personal of terms in the GOP presidential primary last year.

Rubio declined to say Thursday how he would vote or even when he would make a decision.

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“I haven’t made up my mind yet,” he told reporters.

Fighting with Trump over Tillerson gives Rubio, who many think could run for president against some day, a chance to stand out against his colleagues.

Every other GOP senator is expected to vote for Tillerson, who has backing from some of the most influential Republican voices on international affairs: former Secretaries of State James Baker and Condoleezza Rice and former Secretary of Defense Robert Gates.

But the relative unanimity of GOP support for Tillerson could also backfire on Rubio. It’s why some think he’ll end up voting for Tillerson in the end.

“At the end of the day I think he votes for him. That’s a big obligation for Marco to take upon himself, to be the only Republican senator to vote against Tillerson and to say all your Republican colleagues are wrong,” one Republican senator said.

One GOP member of the Foreign Relations Committee expressed surprise in an interview at Rubio’s aggressiveness during Wednesday’s hearing.

Rubio pressed Tillerson to call Russian President Vladimir Putin a war criminal, and to name the government of Saudi Arabia as a human rights violator.

“When has a senator ever asked Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE or John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE to put that label on a nuclear power,” the panel member said, referring to President Obama’s former and current secretaries of State.

The GOP lawmaker described it as a “gotcha” moment, questioning why someone in Trump’s party would try to force a nominee to take the bait.

“I was baffled,” the lawmaker added.

Rubio has kept a relatively low profile since dropping out of the Republican presidential primary and coming close to resigning his Senate seat. He ran for a second term only after personal intervention by Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE (R-Ky.).

Before his failed presidential bid, Rubio was seen as the brightest rising star in the Senate. A good number of colleagues saw him early on as the favorite to challenge Clinton for the presidency.

Rubio developed a reputation in the Senate as a budding expert on international relations and national security.

Colleagues think he’s trying to remind members of his position within the Senate GOP conference by taking a leading role in scrutinizing Tillerson — and buffing up his national name identification in the process.

“Marco before the presidential campaign was very good on international and defense issues and I think he’s trying to get back to that,” remarked a GOP colleague. “He’s also getting a lot of attention for himself.”

But the senator warned that Rubio could wind up derailing his bid to reassert himself by breaking with his party on such a significant question, especially when leading lights such as Baker, Rice and Gates are solidly behind Tillerson.

Losing Rubio — the third-ranking member of the Foreign Relations Committee — would mean that while McConnell could still move Tillerson to the floor, he couldn’t do so with a favorable recommendation because Republicans have only a one-seat advantage on the panel.

Some Republican strategists thought that Rubio shot himself in the foot during the presidential primary by trading personal insults with Trump in a last-ditch effort to save his flailing campaign.

Rubio teased Trump about the size of his hands, telling supporters, “I don’t understand why his hands are the size of someone who is 5’2”. Have you seen his hands?”

Trump responded at a presidential debate in Detroit by declaring, “He referred to my hands, if they’re small, something else must be small. I guarantee you there’s no problem.”

Rubio ended up on the losing end after his running skirmish with Trump, who called him Little Marco, Robot Rubio, a lightweight and mocked his ears “as the biggest ears I’ve ever seen.”

Rubio says he’s not afraid of getting flamed by Trump again.

“I’m not worried, just doing my job,” he said.

Tillerson received positive reviews from other Republicans on the Foreign Relations Committee, including chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), after he testified for more than nine hours without notes.

“If you look at the length of time he’s been involved in these kinds of issues, the length of the hearing… I thought he handled himself very well,” Corker said.

He said Tillerson has “a passion for people around the world and a concern for their wellbeing.”

Corker said that as the likely next secretary of State, he had to be careful not to poison the atmosphere of his first meeting with Putin by stating in a hearing that Putin is a war criminal.

He said “he was probably thinking about his first encounters with these people down the road.”

“I thought he was being prudent in his responses,” he added of Tillerson.