The president has tried to leverage the power of the federal government against his political opponents and legal adversaries, sending the Justice Department after James Comey, a former director of the F.B.I.; Attorney General Letitia James of New York; and one of Trump’s former national security advisers, John Bolton. Trump also wants to use the I.R.S. and other agencies to harass liberal donors and left-leaning foundations. He has even tried to revive lèse-majesté, threatening critics of his administration and its allies with legal and political sanctions. With Trump, it’s as if you crossed the bitter paranoia of Richard Nixon with the absolutist ideology of Charles I.