Fox News contributor Scott Brown criticized Sen. Elizabeth Warren (D-MA) for a series of tweets condemning GOP presidential front-runner Donald Trump, alleging that Warren was “drunk tweeting” and accusing her of being unable to “stand on her own two feet.” Brown, who lost his 2012 Senate race to Sen. Warren and whose political ambitions have long been boosted by Fox News, has been openly pushed by the network as a potential vice presidential running mate for Trump.

Scott Brown, a former Republican Senator for Massachusetts, was hired by Fox News in 2013 after a failed Senate campaign, and left the network soon thereafter to run for office in New Hampshire. During his 2014 Senate bid, Brown received widespread support and praise from Fox, often with no disclosure of his prior affiliation with the network. Following his Senate loss in 2014, Brown re-joined as a contributor. Fox hosts have regularly hyped Brown, who is still a Fox News contributor, as a potential running mate for Trump during the 2016 presidential primary.

During a May 4 interview with Boston Herald Radio, Brown criticized his former rival Elizabeth Warren after she took to Twitter to slam Trump’s “toxic stew of hatred & insecurity” and pledged to “fight my heart out” to ensure Trump’s “racism, sexism, and xenophobia” “never reaches the White House.” Brown “lauded Trump and hit back at Warren in harsh terms,” according to Boston.com. Brown asked if Sen. Warren was “drunk tweeting” and slammed her tweets as “irrelevant,” writing, “She had her chance to make a difference … All she does is yell and criticize and demean and belittle people instead of working for the people of Massachusetts”:

As America began to come to terms with Donald Trump as the Republican presidential nominee on Tuesday, Sen. Elizabeth Warren launched into a series of tweets criticizing the businessman’s “toxic stew of hatred and insecurity.”

A day later, the man she beat to become the U.S. senator from Massachusetts fired back at Warren.

“Is she drunk tweeting now?” Scott Brown said.

The comment came in an interview with Boston Herald Radio on Wednesday in which Brown lauded Trump and hit back at Warren in harsh terms.

“First of all, what she said is completely irrelevant. It doesn’t matter,” Brown said. “She had her chance to make a difference. She hasn’t even bothered to endorse anybody, so it just is a continuation of her phoniness and her inability to make decisions that really have her stand on her own two feet.”

Brown has addressed questions about his own tweeting in the past. In 2013, the former Republican senator posted a series of misspelled, dismissive tweets on a late night. “bqhatevwr,” he infamously wrote. Critics at the time questioned whether Brown was drunk when he sent the mangled tweet.

“I rarely drink, the last time I was ever drunk was my bachelor party,” he said at the time, according to the Washington Post.Herald Radio host Jaclyn Cashman on Wednesday agreed with Brown’s questioning of Warren’s drinking habits.

“I envision her with a glass of Chardonnay in Cambridge,” she said, as Brown laughed. “I guarantee that she was half in the bag tweeting last night.”

Brown, who endorsed Trump for president, said Warren had not accomplished anything of note in office.

“All she does is yell and criticize and demean and belittle people instead of working for the people of Massachusetts,” he said. “If it’s the new norm to go down there and yell and scream at people and divide people, she’s doing a great job at that.”