President Donald Trump is lining up new targets after felling yet another Republican critic in a retribution campaign that he finds deeply satisfying but that comes with widening political risks for his party.

The president's revenge tour against GOP dissenters goes through Louisiana, where incumbent Sen. Bill Cassidy faces two MAGA rivals.

President Donald Trump’s drive for political revenge faces a key test Saturday in Louisiana, where he is looking to defeat Republican Sen. Bill Cassidy five years after Cassidy…