Donald Trump has a message for Ohio Gov. John Kasich, Texas Sen. Ted Cruz, the Bush family Mitt Romney and any other Republican who refused to endorse him: Remember the Supreme Court.

In his post-convention remarks in Cleveland Friday, Trump said he would appoint a conservative judge to the Supreme Court. If his detractors don’t vote for him, presumptive Democratic nominee Hillary Clinton would end up changing the makeup of the court by appointing liberal justices, he said.