Democratic lawmakers in the US are asking Robert F. Kennedy Jr. to stay away from all vaccine-related decisions if confirmed as Secretary of the Department of Health and Human Services because his family could benefit from anti-vaccine litigation.

Kennedy Jr. is revising his ethics agreement to divest his interest in litigation against an HPV vaccine maker and directing the stake to his adult son, The New York Times reported Friday, citing a written response to questions from senators who are weighing his confirmation as Health and Human Services secretary.

Robert F. Kennedy Jr.’s nomination to be the nation’s top health official is uncertain after a key Republican joined Democrats to raise persistent concerns over the nominee’s deep skepticism of routine childhood vaccinations that prevent deadly diseases.

Robert F. Kennedy Jr. will face the Senate for two days of confirmation hearings in a bid become the leader of Health and Human Services.

The health and human services secretary nominee, after questions from Democrats, has agreed to transfer his stake in Gardasil personal-injury lawsuits.

Robert F. Kennedy Jr., President Trump’s nominee for Health and Human Services secretary, told senators Friday he will divest his financial stake in a lawsuit against pharmaceutical giant Merck over its vaccine that protects against human papillomavirus.