US President Donald Trump tightened his grip on the Republican Party on Tuesday as Kentucky voters ousted one of the few conservative lawmakers willing to challenge him openly. Congressman Thomas Massie’s defeat, which he conceded some three hours after polls closed, marked another victory in Trump’s campaign to punish Republican dissent. It follows the rout of Indiana state lawmakers who defied the US president on redistricting and the weekend collapse of Senator Bill Cassidy’s re-election bid...