The Vegas icon used to eat slabs of cheese slathered in peanut butter. Then he made 100 pounds disappear. But he's bummed he can't do that with presidential candidates.

If you're a fan of the magicians-cum-skeptics Penn & Teller, you've likely noticed the absolutely incredible disappearing act they unveiled a year or so ago on the stage of Vegas' Rio casino. No, not "The Vanishing African Spotted Pygmy Elephant Act," in which they make a cow dressed like an elephant go poof, but the one in which Penn, the "larger and louder half of the duo," lost around one-third of his body weight in a five-month span.

Penn gives away the trick in his brand-new book, Presto!: How I Made More than 100 Pounds Magically Disappear and Other Magical Tales, which details his diet regimen as laid out by Ray Cronise, a former NASA scientist and entrepreneur who pushes an extremely restricted plant-based diet (essentially, veganism but with little-to-no added salt, sugar, oil, and fat). Like Penn's old "fat fuck" body (his term), Presto! contains multitudes—it's less a diet memoir than a wide-ranging meditation on contemporary American culture and politics, including the 2016 election.

In the book and in a recent interview, Penn, an outspoken libertarian, has nothing good to say about Hillary Clinton—and even less positive to utter about Donald Trump, with whom he appeared twice on Celebrity Apprentice. Each time, he says with pride, he delivered the best products but lost because he insulted Trump by refusing to pledge his support should the billionaire run for president and saying that his hair looks like "cotton candy made from piss." "There is no one worse than Hillary Clinton," he told me a few weeks ago, "except Donald Trump." As a "war-monger," says Penn, Clinton "will certainly be the killingest president we've had in a long time" but she is ultimately less dangerous than Trump, who he fears will actually unleash nuclear weapons. "If someone questioned his authority in just the right way…" he said, miming the pushing of what we all assume is a bright-red LAUNCH button somewhere in the Oval Office. "I'm supporting [libertarian] Gary Johnson all the way," he says. "You can't find Gary Johnson saying, 'You know, if you don't vote for me, it's the end of the world.'"