After his nomination by Trump, Kennedy initially said he ⁠intended to keep a 10% fee of any settlement involving Gardasil cases he referred to the Wisner Baum law firm, which has ​represented dozens of plaintiffs. Met with concerns from Democratic U.S. Senator Elizabeth Warren of Massachusetts and other lawmakers during the confirmation process, Kennedy then said he would hand over ​his financial interest in vaccine litigation to a son.

Last month, the senators asked whether Kennedy’s son received the health secretary’s share of the Gardasil fees, and if so, how much money that represents. They wanted answers to why Kennedy did not commit to recuse himself from U.S. health agency decisions involving Gardasil, ​or other policymaking around vaccine litigation.

In response, Kennedy said in a social media post earlier this month, that neither he nor anyone else in ​his family have “received a penny” from the Gardasil settlement. Before taking office, Kennedy said he “relinquished any interest in potential Gardasil fees back to the Wisner ‌Baum law ⁠firm.”

In the letter on Monday, Warren and three other lawmakers pointed to Kennedy’s ethics filings and written answers provided to the Senate Finance Committee last year, in which the secretary said he would hand any Gardasil fees to his son. The senators’ staff could find no subsequent filings ​with different information, the letter said.

Kennedy’s ​recent statement, the letter said, ⁠appears to indicate the information he previously provided “is no longer accurate and suggests that you have either modified your ethics agreement or strayed from it altogether.”