Florida Gov. Ron DeSantis bucked his party Tuesday, vetoing a congressional map sent to him by the Republican-led Legislature that he claimed violated the 14th Amendment.

The map submitted by both chambers of the Legislature, passed in defiance of the governor’s threat to veto it, preserved a racially gerrymandered district in violation of the Equal Protection Clause when dividing that district’s majority-black population among the neighboring districts would actually be a more aggressive move for the GOP, DeSantis argued.