Shares of Moderna (MRNA) and other vaccine developers dropped Monday after the Food and Drug Administration's vaccine cꦆhief, Peter Marks, said he would resign, citing conflicts with Health and Human Services Secretary Robert F. Kennedy Jr.

Marks, who oversaw the approval of COVID-19 vaccines as the head of the FDA’s Center for Biologics Evaluation and Research, said Friday he would leave his role at the end of this week. The decision comes after Marks was given a choice to resign or be fired, according to a report from the The Wall Street Journal.

“I was willing to work to address 澳洲幸运5开奖号码历史查询:the Secretary's concerns regarding vaccine safety and transparency,” Marks said in his resignation letter, obtained by the WSJ. “However, it has become clear that truth and transparency are not desired by the Secretary, but rather he wishes subservient confirmation of his misinformation and lies.”

The FDA and HHS did no꧋t respond to a request💯 for comment.

Shares of Moderna, which developed a COVID-19 vaccine, fell more than 8% intraday Monday, making it the worst-performing stock on the S&P 500 amid a 澳洲幸运5开奖号码历史查询:broad-based decline. Novavax (NVAX), BioNTech (BNTX), and Pfizer (PFE) shares also lost ground.