The conservative talker excoriated De Niro for his profanity laced speech against President Trump.

Dennis Prager will be the first to tell you he didn’t hop aboard the Trump Train during the 2016 primaries.

The syndicated talk show host preferred the other candidates in the crowded GOP field. Once the real estate mogul emerged victorious, though, Prager embraced him as the last defense against a second Clinton presidency.

Prager has no regrets about his decision. In fact, he’s one of President Trump’s most reliable defenders now. That’s why he took special note of actor Robert De Niro’s latest anti-Trump screed.

The Oscar winner tore into Trump during the National Board of Review awards Jan. 9. The Hollywood legend, no stranger to Trump bashing, outdid himself in a way that would earn him repeated bleeps at any televised awards show.

It was fascinating watching The Post. That story took place nearly 50 years ago, but there many parallels today, obviously. At the time of the story, Donald Trump was suffering from (air quotes) “bone spurs.” Today the world is suffering from the real Donald Trump. Come on. You know. What are we talking about? This f***ing idiot is the president. It’s the Emperor’s New Clothes. This guy is a f***ing fool …

Our government today with the [prompting] of our baby-in-chief—our jerkoff in chief, I call him—has put the press under siege, ridiculing it through trying to discredit it through outrageous attacks and lies. And again, just like 1971, the press is distinguishing itself with brave, exacting journalism.

De Niro must have missed the avalanche of journalism gaffes over the past 12 months. Prager didn’t. He also refused to let De Niro get away with his vile comments on the talker’s Jan. 10 broadcast.

“Robert De Niro is an idiot. Robert De Niro is exactly what he describes the president, that’s the amazing thing,” Prager said. “It so saddens me because I so enjoy his acting, but Bob, I gotta tell ya, you’ve lost me as a viewer.”

Prager, who is currently working on the documentary “No Safe Spaces,” addressed the tone of the actor’s comments next.

“It’s not because I’m defending the President. If a right-wing actor, which is almost an oxymoron, would say at a thing, ‘Barack Obama is an f-ing idiot’ I could not watch the guy’s films any more. First, I don’t like public cursing … it only reflects poorly on the lack of self control of the individual speaking.”

RELATED: Media Mock Prager, Carolla for ‘No Safe Spaces’ Documentary

He then used De Niro to collectively attack liberal actors and their political posturing.

“Robert De Niro comes across as a sophisticated thinker … these guys have lost their minds much more than the President.”

They’re not just fools. They’re arrogant fools,” he continued. “Other than the crowd you hang out with you think anybody gives a damn what Robert De Niro thinks of the president? Have you ever established yourself as a serious thinker?”

Prager later offered a challenge to De Niro. Come on his syndicated radio show and have a fair and honest debate about President Trump. Prager vowed to treat the star with the utmost respect. It wouldn’t be the first time he allowed a harsh critic enter his studio. Prager recently invited a man who tried to get him removed from a conducting gig last year along with the gentleman’s wife.

Will the Hollywood tough guy take the challenge? Stay tuned.

BONUS: Here’s a peek at Prager’s upcoming documentary with Adam Carolla showing the fight for free speech on college campuses nationwide.