With the recent launch of his new book, #SAD: Doonesbury in the Time of Trump, Garry Trudeau sat down for an exclusive interview with Rolling Stone. 

Once called a "third-rate cartoonist" by Donald Trump, Trudeau has been chronicling the exploits of our current president since he was a boisterous Manhattan developer in the 1980s. Here's what Trudeau says to Rolling Stone about how Trump has changed over the years:

While his underlying personality disorder has remained remarkably stable, in recent years Trump seems to have burned off any remaining social constraints and is rapidly contracting into a more concentrated version of himself — pure, juvenile id. Even his working vocabulary seems to be shrinking, although that could be an illusion created by the hyper-repetition of his best words (“no collusion,” “witch hunt,” “treated so unfairly,” etc.). 

This month marks 50 years since Doonesbury first appeared in the Yale University student newspaper The Daily News. Trudeau said he plans to continue the strip at least "until Trump leaves town."

As for his artistic legacy, Trudeau had this to say:  

I don’t exactly want it, but it’s entirely possible my legacy will be the introduction of bad art to the comics. Doonesbury made Cathy, Dilbert, xkcd and many other barely drawn strips possible. By spinning my early panels as intentionally raw and edgy, as urgently scribbled dispatches from the front lines of the revolution, my syndicate and I unwittingly ushered in an era of post-virtuosity.