“Avengers” star Chris Evans is calling out Sen. Lindsey Graham (R-S.C.) for his complete about-face on President Trump.

Now one of Trump’s staunchest allies, Graham was once one of his sharpest critics.

“You know how you make America great again? Tell Donald Trump to go to hell,” Graham told voters in December 2015.

He has also criticized Trump’s conduct towards the late-Senator John McCain, his response to alleged crimes committed by Saudi Crown Prince Mohammed bin Salman and—most recently—his sudden decision to withdraw American troops from Syria.

Evans reminded Graham of those comments, accused him of doing a “shameful 180” and then wondered if the senator was somehow compromised:

Hey Smithers, remember when you said this:

‘You know how you make America great again, tell Donald Trump to go to hell.’

What do they have on you? I can’t tell if this shameful 180 is born of fear or thirst. Either way, we will always remember you as nothing more than remora. https://t.co/2eZ2Zxqpkv — Chris Evans (@ChrisEvans) January 13, 2019

The “Smithers” line refers to a character on “The Simpsons,” where Smithers is the toady to the show’s wealthy villain, Mr. Burns.

Social media was quick to back their favorite superhero:

We need a visual for Graham-ora, maybe @JimCarrey can help out with that. — Lullaby (@lullaby_love_) January 13, 2019

Enjoy my personally commissioned piece as well. By @JarOfComics pic.twitter.com/oMWMTXf1gB — Travis Brown (@ClassicT_4) January 13, 2019

Did this dude just call him Smithers??? I am here for this @ChrisEvans… Actual footage of Graham and Trump: ??? pic.twitter.com/gxdxL9yWAM — Keisha Lambright (@QueenLambright7) January 13, 2019

Captain America vs. Lindsey Graham pic.twitter.com/uCjzOQuWKy — ElElegante101 (@skolanach) January 13, 2019

We will also remember Lindsey Graham for this: https://t.co/ftLaWCvyV6 — Simon Hedlin (@simonhedlin) January 13, 2019

This is why Lindsey is unworthy of having a female name. — laney (@misslaneym) January 13, 2019

::deep sigh:: I can't believe I spent time on this pic.twitter.com/UXUaHkU45z — ? Citizen Snips ? (@Sedna_51) January 14, 2019

I’ve always called Lindsey “Butters”, but you’re right, “Smithers” is so much more fitting. pic.twitter.com/P4xfOF3MvH — Twiddlebird❄️⛄️❄️ (@twiddlebirdlet) January 13, 2019

Last month, Graham claimed—without providing any evidence or justification—that Trump’s proposed border wall would form part of America’s protection against “radical Islam,” describing it as the country’s “last line of defense” against global Islamic terrorism.

The attack by Evans, a frequent Trump critic who plays Captain America on the big screen, follows a similar statement made by MSNBC host Stephanie Ruhle who implied on air, without evidence, that Graham’s change-of-heart is connected to an “extreme” secret over which he is being blackmailed.