Freshman Sen. Marco RubioMarco Antonio RubioHillicon Valley: Experts worry North Korea will retaliate with hacks over summit | FBI works to disrupt Russian botnet | Trump officials look to quell anger over ZTE | Obama makes case for tighter regs on tech Putting pressure on Trump, House passes bill barring government from doing business with ZTE The Hill's Morning Report — Sponsored by PhRMA — Tensions mount for House Republicans MORE (R-Fla.) was elected with strong Tea Party support, but he is not sure that forming a Senate Tea Party Caucus is a good idea.

Rubio is not expected to attend the group's first meeting on Jan. 27, but he went further in a recent interview, saying that the caucus could co-opt the grassroots conservative movement. 

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"My concern is that politicians all of a sudden start co-opting the mantle of Tea Party. If all of a sudden being in the Tea Party is not something that is happening in Main Street, but rather something that’s happening in Washington D.C.," he said in an interview with the Shark Tank, a Florida political website. "The Tea Party all of a sudden becomes some sort of movement run by politicians. It’s gonna lose its effectiveness and I’m concerned about that."

Even though the Tea Party movement had a tremendous affect on Senate GOP primary races around the country, the Capitol Hill group has only three members committed to attending its first meeting: Sens. Mike LeeMichael (Mike) Shumway LeeTrump has exposed Democratic hypocrisy on prison reform Denial of services to same-sex couples can harm their health GOP Senate primary heats up in Montana MORE (R-Utah), Rand PaulRandal (Rand) Howard PaulPro-Trump super PAC raises .5 million in 6 weeks Trump has exposed Democratic hypocrisy on prison reform Overnight Energy: Reporters barred from Day 2 of EPA summit | Dems blame Trump for gas price increases | Massachusetts to get new offshore wind farm MORE (R-Ky.) and Jim DeMint (R-S.C.) 

Other senators elected with the help of Tea Party activists, such as Ron JohnsonRonald (Ron) Harold JohnsonHouse GOP sets three FBI interviews in Clinton probe Overnight Health Care — Sponsored by PCMA — House passes 'right to try' drug bill | Trump moves to restrict abortion referrals House approves 'right to try,' sends bill to Trump's desk MORE (R-Wis.) and Pat Toomey (R-Pa.) have also declined to join the caucus.

Rep. Michele BachmannMichele Marie BachmannBachmann won't run for Franken's Senate seat because she did not hear a 'call from God' Billboard from ‘God’ tells Michele Bachmann not to run for Senate Pawlenty opts out of Senate run in Minnesota MORE (R-Minn.) last year created a Tea Party Caucus in the House, which had nearly 30 members at the end of 2010.

But membership in the group might not become a litmus test for Republican lawmakers. Some conservative bloggers have echoed Rubio's concern about the caucus.

"When Representative Michele Bachmann spearheaded the Tea Party Caucus in the House, I had mixed emotions. When one person or a group of people claim to represent ideas, then the whole movement can be tainted by the missteps of the individual," Melissa Clouthier wrote at the conservative blog RedState in a post about Rubio's membership.

Rubio was an early underdog in the Florida Republican Senate primary behind Gov. Charlie Crist. But he eventually picked up momentum with the help of the Tea Party and drove Crist out of the race, and later the GOP. Rubio defeated Crist, who ran as an Independent, and Rep. Kendrick Meek (D) in the general election.

The Florida senator and conservative favorite said he would be joining the Senate Steering Committee, an existing group of conservative senators. 

"Why do we need something in addition to the steering committee?" Rubio asked. "And there maybe a good reason. I'm curious to hear about that."

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h/t Senatus