Former Pennsylvania Sen. Rick Santorum (R) said Monday he wishes President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE would "send emails to a therapist" instead of sending tweets.

Santorum made the comment on CNN's "Anderson Cooper 360" when asked his thoughts on Trump's Sunday tweetstorm which included criticism of the late Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (R-Ariz.).

"Look, there's nothing I'm going to do to defend the president and this type of activity," Santorum said. "He's doing a good job in many respects as president and then he does this and diverts attention from things that are positive."

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He then suggested tweeting might be Trump's "therapy."

"My guess is this is his time to sort of let it all out," he continued. "I wish he wouldn't do it. I wish he'd write them and send emails to a therapist as opposed to sending tweets to the general public."

Former GOP Sen. Rick Santorum on Pres. Trump's Twitter habit. #AC360 pic.twitter.com/yc1XNMPi5P — Karim El Hani - كريم الهاني (@Itskarimelhani) March 19, 2019

Santorum's comment comes after George Conway, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE’s husband, suggested that the president has at least two diagnosable personality disorders.

Conway, a frequent Trump critic, on Monday shared on Twitter an image of the cover of the Diagnostic and Statistical Manual of Mental Disorders and the pages for narcissistic personality disorder and antisocial personality disorder.

Trump over the weekend sent out 29 tweets, some of which were retweets, commenting on a range of subjects from the New Zealand mosque shootings to perceived bias on "Saturday Night Live."

Trump twice on Saturday and Sunday singled out McCain for criticism, which prompted backlash from other lawmakers and McCain's daughter, Meghan McCain.