Sixteen months into his second presidency, Donald Trump may be as unpopular as he has ever been among the American electorate – but his grip on his core base of Maga voters remains unshaken.That power was on full display over the last two weeks, as Trump ousted a string of fellow Republicans he considered apostates for not showing him enough personal fealty.The president’s revenge tour continued on Tuesday, when a hand-picked loyalist defeated US congressman Thomas Massie, a frequent critic,...