President Donald Trump recently named Lt. Gen. H.R. McMaster to be his latest national security adviser, and for a bit of fun, CNN’s Jake Tapper shared a clip from a few years ago in which the general made a Seinfeld reference while taking about military strategy.

McMaster, during the first annual Future of War Conference in 2015, compared Rapid Decisive Operations to George Costanza leaving a room after a comedic high note, a classic joke from the 1998 episode, “The Burning.” 

A fan pointed the reference out through Twitter to Jason Alexander, who wasn’t too impressed to see his iconic TV character quoted in such fashion. 

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“Yes, I”m so proud….dear God :(,” Alexander responded. 

Needless to say, that did not go over well with some Trump supporters who began trolling the actor for speaking his mind. 

Alexander fired right back, telling some of his critics he would not “shut his mouth” simply because he is an entertainer.

“And lastly, my comment intended no disrespect to Gen. McMaster, who seems a fine man. Just the weirdness of any leader quoting ‘George,'” Alexander wrote. 

See all of Alexander’s back and forth and the classic joke below: 

Yes, I”m so proud….. dear God 🙁 XCDsra52Dz

— jason alexander (@IJasonAlexander) February 21, 2017

Capt., with respect, noting hypocrisy, lies & flagrant disregard for more than half of Americans isn’t being an a-hole, it’s pointing at 1. hK2Iilk4Vl

— jason alexander (@IJasonAlexander) February 22, 2017

And no sir, I will not “shut my mouth”. You served our country for it’s freedoms, I’ll damn well exercise them. thank you for your service. hK2Iilk4Vl

— jason alexander (@IJasonAlexander) February 22, 2017

And lastly, my comment intended no disrespect to Gen. McMaster, who seems a fine man. Just the weirdness of any leader quoting “George”.

— jason alexander (@IJasonAlexander) February 22, 2017

You don’t see me telling anyone to shut up. I welcome decent discourse. vPQm5KupNF

— jason alexander (@IJasonAlexander) February 22, 2017