Sidley Austin partner Peter Keisler, former acting U.S. attorney general in the George W. Bush administration, has left the Republican Party, as it became in the era of former President Donald Trump, he said, “something I feel no affinity with.”

Keisler, a leading Supreme Court advocate and former clerk to Justice Anthony Kennedy, said his decision to change his registration to “independent” was made “easy in a sense” because of Trump.