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Florida Sens. Marco Rubio and Bill Nelson both oppose Trump's nomination of Jim Bridenstine

Rubio said he worried that Bridenstine would bring political baggage into the agency.

Washington CNN  — 

A bipartisan group of senators is opposing President Donald Trump’s pick to head NASA, arguing he is a political appointee who doesn’t have the necessary experience to run the agency.

Florida Sens. Marco Rubio, a Republican, and Bill Nelson, a Democrat and former astronaut, both oppose Trump’s nomination of Jim Bridenstine – a current GOP congressman from Oklahoma and former Navy aviator.

“I just think it could be devastating for the space program. Obviously, being from Florida, I’m very sensitive to anything that slows up NASA and its mission,” Rubio told Politico.

Both senators said they worried that Bridenstine would bring political baggage and that his lack of formal science education would hold up the nomination process for a key appointment. Bridenstine graduated from Rice University with majors in economics, psychology and business and has an MBA from Cornell. After serving in the military, he worked a four-year stint as executive director of the Tulsa Air and Space Museum & Planetarium.

“It’s the one federal mission which has largely been free of politics and it’s at a critical juncture in its history,” Rubio said of NASA. “I would hate to see an administrator held up – on (grounds of) partisanship, political arguments, past votes, or statements made in the past – because the agency can’t afford it and it can’t afford the controversy.”

Nelson said in a statement: “The head of NASA ought to be a space professional, not a politician.” Nelson is the ranking member on the Senate committee on commerce, science and transportation and would vote on Bridenstine’s confirmation.

Ohio Democratic Sen. Sherrod Brown expressed concern over Bridenstine’s history of climate denial and condemned his pick in a campaign fundraiser email sent Tuesday evening.

“Bridenstine is not a scientist. He has no experience in scientific research or academia. He’s even expressed doubt that humans contribute to climate change – a research area in which NASA is intimately involved,” the email read. “What Bridenstine does have going for him – he’s a politician, he has a mild interest in space policy, and he supports Donald Trump.”

White House spokesperson Ninio Fetalvo defended the President’s pick of Bridenstine, saying that Trump “selects the highest caliber of individuals to fill positions in his administration” and that Bridenstine’s tenure in Congress was “defined by a focus toward space.”

“He has consistently been one of NASA’s strongest advocates in Congress. Due to his efforts, in 2015 SpaceNews named Bridenstine one of ‘5 Space Leaders Making a Difference.’” He is also the former executive director of the Tulsa Air and Space Museum Planetarium,” Fetalvo told CNN in a statement.

NASA’s acting Administrator Robert Lightfoot, said he was “pleased” by the nomination.

“I am pleased to have Rep. Bridenstine nominated to lead our team. Of course, the nomination must go through the Senate confirmation process, but I look forward to ensuring a smooth transition and sharing the great work the NASA team is doing,” he said in a statement.

GOP Sen. Ted Cruz of Texas, chairman of the Senate Subcommittee on Space, Science and Competitiveness, also said he supported the nomination, calling Bridenstine, “A strong, principled and effective leader” as well as a close ally in the House and a “dear friend.”

Cruz added: “I am confident that as the next NASA administrator, Jim will work hard to advance our national space policy goals, expand human space exploration and secure America’s leadership in space.”

Bridenstine’s office did not respond to requests for comment from CNN.

NASA conducts research and publishes reports on the Earth’s changing climate, monitoring weather patterns with American satellites. Yet Bridenstine has a documented history of questioning the science behind climate change.

Speaking on the House floor in 2013 Bridenstine incorrectly said that global temperatures stopped rising 10 years earlier.

“Mr. Speaker, global temperatures stopped rising 10 years ago. Global temperature changes, when they exist, correlate with sun output and ocean cycles. During the Medieval Warm Period from 800 to 1300 AD – long before cars, power plants, or the Industrial Revolution – temperatures were warmer than today. During the Little Ice Age from 1300 to 1900 AD, temperatures were cooler. Neither of these periods were caused by any human activity,” Bridenstine said.

In a 2016 interview with Aerospace America, Bridenstine argued that the climate is simply always changing.

“I would say that the climate is changing. It has always changed. There were periods of time long before the internal combustion engine when the Earth was much warmer than it is today,” he said. “Going back to the 1600s, we have had mini ice ages from then to now.”

Earlier this year, the congressman scrubbed some of his previous Internet history. Bridenstine’s campaign-related Facebook, YouTube and Twitter accounts have been deleted entirely, a CNN KFile review found. Several posts on the Facebook page of Bridenstine’s congressional office have also been deleted. Radio interviews and videos he was featured in were additionally removed from public view.

Bridenstine joins Sam Clovis – Trump’s longtime campaign aide picked to head science at the US Department of Agriculture – as another nomination for a key science role despite having little experience in the subject. Although it is not necessary for the head of NASA to be a scientist, if confirmed, Bridenstine would be the first elected official to serve as NASA administrator.

In the past, Bridenstine has expressed a personal interest in space development. Last year, he introduced the American Space Renaissance Act, which would “permanently secure the United States of America as the pre-eminent spacefaring nation,” according to a website for the bill.

“Our space architectures must be resilient and our national security terrestrial systems must be interoperable with both military and commercial space systems. We must be able to deter attacks, defend government and commercial assets, and defeat threats when necessary,” it states.

The bill states that NASA’s first priority should be landing a man on Mars and it would shift power from the president to Congress by creating a 21-member commission to oversee NASA.

CNN’s Sophie Tatum contributed to this report.