BATON ROUGE, La. (AP) — Sen. Bill Cassidy has emerged as a central figure in the confirmation of Robert F. Kennedy Jr., whose nomination to health and human services secretary poses an equally consequential moment for the second-term Republican facing an uncertain political future in Louisiana.

Some GOP senators want public commitments from Robert F. Kennedy Jr. before deciding whether to support him as the next secretary of the Department of Health and Human Services, signaling that President Donald Trump’s pick will have to win over uncertain Republicans in order to secure the job.

A key Republican senator Thursday said he was struggling with whether to support Robert F. Kennedy Jr.’s nomination to be head of the Health and Human Services Department, reflecting some of the widespread concerns lawmakers have as they approach Kennedy’s confirmation vote.