President Trump and his allies waged war against Michael Cohen Wednesday, one day after the president’s former lawyer and fixer implicated Trump in a felony during the 2016 campaign. Cohen’s charge that he paid off two women who said they had sexual relationships with Trump — and, crucially, that he had done so at the then-candidate’s behest and with the intention of affecting the election — is reverberating across the political world. But Trump’s team is seeking to blunt the impact by taking aim at Cohen’s credibility, downplaying the seriousness of the offenses being alleged — and insisting that the...