Gov. Jared Polis on Thursday cheered anti-vaccine advocate Robert F. Kennedy Jr.’s nomination to lead the nation’s top public health agency, highlighting the controversial nominee’s stances on “big pharma” and “corporate ag.”

Polis, a Democrat, faced quick pushback on social media after he said he was “excited” by President-elect Donald Trump’s selection, and he posted again an hour later to clarify his thoughts. A spokesman for the governor then further walked back Polis’ support for Kennedy in a statement to The Denver Post.

Trump, a Republican, nominated Kennedy to lead the U.S. Department of Health and Human Services. In the presidential race, Kennedy initially had sought the Democratic nomination, then ran as an independent. A member of the dynastic Kennedy family, he later abandoned his presidential campaign and backed Trump.

Kennedy has pushed a number of public health conspiracies, most prominently around vaccines, and has advocated for other positions that are generally out of the mainstream, such as more availability of unpasteurized milk. He has said he wants to remove fluoride from the American water supply, and when he ran for president, he said he wanted to pause research into pharmaceuticals and infectious diseases for at least eight years.

He has falsely suggested that COVID-19 was “ethnically targeted” to “attack” certain groups and that mass shootings have been caused by prescription drugs, among other debunked conspiracy theories.

Kennedy has adopted some mainstream health positions, such as limiting ultra-processed foods and the use of pesticides in growing crops. Polis, citing specific quotes by Kennedy, focused on those latter views in his first post Thursday afternoon on the social platform X.

“‘In some categories, there are entire departments, like the nutrition department at the (Food and Drug Administration) that are — that have to go, that are not doing their job, they’re not protecting our kids,” Polis quoted Kennedy as saying, then added himself: “YES! The entire nutrition regime is dominated by big corporate ag rather than human health and they do more harm than good.”

Polis — who’d previously criticized Kennedy’s anti-vaccine stances this summer — acknowledged those positions in his posts Thursday but urged his 136,000 X followers to hold off on mocking or disagreeing with Kennedy.

He said Kennedy had “helped us defeat vaccine mandates in Colorado in 2019.” He was referring to a defeated legislative measure that would have made it harder for parents to opt out of vaccine mandates for public schools.

Polis wrote that he hoped Kennedy would make vaccines a matter of choice, not about bans or requirements.

Polis’ comments drew swift backlash. Outgoing state Rep. David Ortiz, a Littleton Democrat, called the governor’s endorsement “pathetic pandering.” Rep. Javier Mabrey, a Denver Democrat, quipped on X: “Yikes.” Shad Murib, the chair of the Colorado Democratic Party, tweeted “Welp” shortly after Polis’ comments, and he subsequently criticized Kennedy’s conspiratorial history in a Thursday evening statement from the party.

Mullica rejected Polis’ suggestion that state officials had sought vaccine mandates in the past. He said legislators worked to improve immunization rates through medical exemption reform and through education. Polis previously supported parents’ ability to opt out of vaccinations — drawing support from anti-vaccine advocates — despite the state’s poor rankings for pediatric immunization.

“The biggest thing is — look, science matters, man,” Mullica continued. “And with all the disinformation and misinformation that’s being put out by people like RFK Jr. and the internet, we need leaders who can stand up, follow the science, understand it and (make) sure we are making decisions based on evidence and science.”

Asked why Polis endorsed Kennedy in light of his often-conspiratorial stances, a spokesman for the governor responded by referring to a subsequent Polis social media post. The spokesman, Eric Maruyama, then issued a statement distancing the governor from the controversial figure he had just backed.

Maruyama wrote that Polis “does not endorse actions that would lead to measles outbreaks and opposes unscientific propaganda.”

“Governor Polis has not changed his view as a whole on RFK Jr. or on the Governor’s previously stated concerns regarding some of RFK Jr’s positions,” Maruyama wrote. “While opposed to RFK’s positions on a host of issues, including vaccines and banning fluoridation, (Polis) would appreciate seeing action on pesticides and efforts to lower prescription drug costs and if Trump is going to nominate someone like him then let them also take on soda, processed food, pesticides and heavy metals contamination.”

Polis’ support of a particularly controversial Trump cabinet pick came days after he and Illinois Gov. JB Pritzker unveiled an broadly defined group to oppose “increased threats of autocracy.”

After Polis faced pushback Thursday, he added the second X post, which defended vaccine access and science as a cornerstone to any public health policy.

“Science must remain THE cornerstone of our nation’s health policy and the science-backed decision to get vaccinated improves public health and safety,” Polis wrote. “But if as a country we follow the science we would also be far more concerned about the impact of pesticides on public health, ag policy on nutrition, and the lack of access to prescription drugs due to (drugs’) high prices.”