Sen. Thom Tillis (R-N.C.) promised to have “a lot of fun” with his remaining time in office in response to Donald Trump’s latest attack.

Tillis has been critical of the Trump administration since he announced earlier this year that he would not be seeking reelection to the Senate. This week, he slammed the Trump administration’s decision to set up an ‘anti-weaponization fund’ to reward allies of the president whom they believed were targeted by the Biden Justice Department, including members of the pro-Trump mob that stormed the Capitol on January 6, 2021.

Tillis called the fund “stupid on stilts” during an interview with a local reporter, according to Mediaite, adding, “The American people are going to reject this out of hand. When you take money from me to give to a purpose that I vehemently disagree with, that’s tyranny, and that’s what that account is.”

Trump responded in a post on Truth Social, calling Tillis “weak and ineffective” and a “QUITTER” who he forced out of the Senate after refusing to endorse him.

“Now he can have all the fun he wants for a few months, with some of his RINO friends, screwing the Republican Party,” Trump added. “In the end it will only get bigger, and better, and stronger, than ever before!!!”

Tillis fired back on Twitter, agreeing with Trump “about having a lot of fun over these next seven months,” and listing instances where he believes Trump’s advisors have steered him down the wrong path.

“Some of your advisors are telling you to support things like: Using billions of taxpayer dollars to compensate convicted felons and thugs who attacked police. (Ed Martin). Pushing 50-year mortgages and Elizabeth Warren’s housing bill over sound conservative housing policy. (Bill Pulte). Using taxpayer money to transform publicly traded companies into state-owned enterprises. (Howard Lutnick). Firing our very best generals and not holding Putin accountable for his systematic kidnapping, rape, torture, and murder of Ukrainian civilians. (Pete Hegseth),” Tillis wrote.

“If opposing these things makes me a RINO, then I gladly accept that nickname,” he continued. “We need Republicans to do well in November, but the stupid stuff is killing our chances!”