"A few months before he died, in 2018, [Philip] Roth told me in an interview that he never intended his book as a political allegory. But by then, with the Trump administration in full swing..."

"... he agreed that the parallels between the world he invented and what was happening in contemporary America were hard to ignore: a demagogic president who openly expresses admiration for a foreign dictator; a surge of right-wing nationalism and isolationism; polarization; false narratives; xenophobia and the demonization of others."

From "‘The Plot Against America’ Imagines the Rise of an Intolerant Demagogue/David Simon has translated Philip Roth’s 2004 alternate history novel into an HBO mini-series, Simon’s first literary adaptation" by Charles McGrath (NYT).

From McGrath's 2018 interview with Roth:

ROTH: However prescient “The Plot Against America” might seem to you, there is surely one enormous difference between the political circumstances I invent there for the U.S. in 1940 and the political calamity that dismays us so today. It’s the difference in stature between a President Lindbergh and a President Trump. Charles Lindbergh, in life as in my novel, may have been a genuine racist and an anti-Semite and a white supremacist sympathetic to Fascism, but he was also — because of the extraordinary feat of his solo trans-Atlantic flight at the age of 25 — an authentic American hero 13 years before I have him winning the presidency. Lindbergh, historically, was the courageous young pilot who in 1927, for the first time, flew nonstop across the Atlantic, from Long Island to Paris. He did it in 33.5 hours in a single-seat, single-engine monoplane, thus making him a kind of 20th-century Leif Ericson, an aeronautical Magellan, one of the earliest beacons of the age of aviation. Trump, by comparison, is a massive fraud, the evil sum of his deficiencies, devoid of everything but the hollow ideology of a megalomaniac.