Every Saturday since the end of January, comedian Louis C.K. has emailed his fans to announce each subsequent episode of his new show Horace and Pete. This week's came with a lengthy postscript plea.

"Please stop it with voting for Trump," he said at the end of Saturday's email. "It was funny for a little while. But the guy is Hitler ... Hitler was just some hilarious and refreshing dude with a weird comb over who would say anything at all."

Comedian Louis C.K. has pleaded with voters not to choose Donald Trump.

The email may be a marketing ploy for the new show, but that isn't Louis C.K.'s style. (In fact, he inveighs against marketing in favour of establishing a more genuine connection with his audience.)

Instead, the email seems like a genuine plea – a more than 1,400-word plea for fans not to vote for the leading Republican presidential candidate. Trump is "dangerous," "insane," and a "bigot," he said.