Trump's endorsement power faces new test in Louisiana Republican Senate showdown

President Donald Trump's influence in Republican primaries faces scrutiny as Louisiana voters choose between Julia Letlow and John Fleming for the Senate seat. Letlow, endorsed by Trump and Louisiana Gov. Jeff Landry, and Fleming, a former Trump White House official, compete in a runoff after no candidate secured 50% in the initial primary. A Fleming victory would mark a third endorsement setback for Trump in recent GOP races.