Donald Trump slammed Harry Reid on Monday after the ailing former senator said that Trump was the worst president the country has ever seen.

“Former Senator Harry Reid (he got thrown out) is working hard to put a good spin on his failed career,” Trump wrote on Twitter Monday morning.

“He led through lies and deception, only to be replaced by another beauty, Cryin’ Chuck Schumer. Some things just never change!”

Former Senator Harry Reid (he got thrown out) is working hard to put a good spin on his failed career. He led through lies and deception, only to be replaced by another beauty, Cryin’ Chuck Schumer. Some things just never change!

— Donald J. Trump (@realDonaldTrump) February 25, 2019

Reid, who was Senate Majority leader from 2007 to 2015, told CNN that Trump made former President George W. Bush look like the Babe Ruth of Republican presidents.

Reid served in the Senate under Bush’s presidency and often called the 43rd president a “loser,” “liar,” but said Trump was the worst president the U.S. ever had.

“He and I had our differences, but no one ever questioned his patriotism. Our battles were strictly political battles,” Reid said, adding that he now wished every day for Bush to be president again. “There’s no question in my mind that George Bush would be Babe Ruth in this league that he’s in with Donald Trump in the league. Donald Trump wouldn’t make the team.”

Reid, 79, was diagnosed with pancreatic cancer last year. He told CNN he is in remission thanks to early detection and intense chemotherapy.

Former CIA Director John Brennan responded to Trump’s attack on Reid and called Trump “selfish” and “shameful”.

Brennan, a frequent critic of Trump, took issue with the president’s tweet accusing Reid of trying to “put a good spin on his failed career.”

“You shame yourself & the Office of the Presidency every time you try to smear those who dedicate their lives to public service,” Brennan tweeted.

“These elected officials, like so many others, have worked selflessly on behalf of their fellow citizens, something unfamiliar to one as selfish as you.”

You shame yourself & the Office of the Presidency every time you try to smear those who dedicate their lives to public service. These elected officials, like so many others, have worked selflessly on behalf of their fellow citizens, something unfamiliar to one as selfish as you. https://t.co/zqAIofpjSc

— John O. Brennan (@JohnBrennan) February 25, 2019