Justice Clarence Thomas said Tuesday the Supreme Court will not be able to duck the issue of abortion forever and raised concerns about the potential for abortion to “become a tool of eugenic manipulation.”

Thomas’ warning came in a concurring opinion in which he agreed with a decision by the Supreme Court not to review a provision of an Indiana law that bans abortion on the basis of race, sex, or disability. In an unsigned opinion, the high court upheld another provision of the law that mandates the burial or cremation of fetal remains after an abortion.