Stephen Colbert and other late night hosts are quickly learning that Donald Trump equals big ratings.

Deadline Hollywood, which tracks television ratings, reports that The Late Show with Stephen Colbert garnered the most viewers for its time slot in its third week with the help of The Donald. Colbert beat out his top rival – The Tonight Show Starring Jimmy Fallon – with 4.15 million viewers to Fallon’s 4.04 million in week three of taking over the CBS show from David Letterman, according to Live+ 7 statistics cited by Deadline.

“I want to thank you, not only for being here, but for running for president,” Colbert told Trump. “I’m not going to say this stuff writes itself, but you certainly do deliver it on time every day.”

Deadline Hollywood reports “Colbert didn’t so much interview Trump as perform WWE Theatre with the reality TV star turned GOP front-runner, pretending he was twapping the guy, but making it clear it was all for fun and ratings.”

“Donald Trump is here … Finally a place on TV to hear about Donald Trump,” Colbert joked. “He is the GOP front-runner. Who knows, one day I might be able to tell my kids I interviewed the last President of the United States.”

Colbert challenged Trump to a game in which the presidential candidate chose whether a quote came from him, or from Colbert’s Comedy Central show, and The Donald got all of the quotes correct, including a curveball.

The quotes included “It’s freezing and snowing in New York. We need global warming,” and “Medicare is like a nice set of cufflinks. Nobody wears cufflinks anymore,” Rolling Stone reports.

“The last statement – ‘The real strong have no teed to prove it to the phonies’ – stumped him; he knew it wasn’t his, but didn’t think it sounded Faux-Colbert-ish either,” according to Deadline Hollywood. “Trump was right again: The line was Charles Manson’s.”

The duo also talked about Trump’s candidacy before he signed a copy of his bestselling book “The Art of the Deal” for Secretary of Energy Ernest Moniz, the chief architect of the Iran nuclear deal whom Colbert also invited on the show but didn’t appear.

Colbert asked Trump to sign his book for Moniz with the message “Better luck next time,” according to the site.

“I was just going to say that, but I don’t want to be a wiseguy,” Trump said. “I want to be a nice guy.”

Trump’s Sept. 22 appearance on The Late Show was the boost the show needed after dipping into second for total late night viewers in its second week. In the program’s first week it also topped the charts.

The week two slip, however, was also The Donald’s work.

“Not coincidentally, about a week earlier, Trump has visited NBC’s late-night rival, Tonight Show and pounded Colbert in the ratings that night,” Deadline reported. “And, remember who won that week in total viewers? Tonight Show.”