Former Republican presidential contender Rick Santorum Sunday said Donald TrumpDonald TrumpCuban embassy in Paris attacked by gasoline bombs Trump Jr. inches past DeSantis as most popular GOP figure in new poll: Axios Trump endorses Ken Paxton over George P. Bush in Texas attorney general race MORE is qualified to be commander in chief, following Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump Jr. inches past DeSantis as most popular GOP figure in new poll: Axios House rejects GOP effort to seat McCarthy's picks for Jan. 6 panel Senators scramble to save infrastructure deal MORE's (R-Ky.) refusal to say the same thing. 

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"You think he's qualified?" asked ABC host Martha Raddatz on "This Week." 

"Well, I do. I mean, I've had the opportunity to spend some time with Donald Trump," Santorum, Trump's former primary rival, said. 

"As you can imagine, I mean, he's a very engaging man. He's — he puts on an image as a lot of candidates and I think all of us do when we're in front of a microphone that's really tough and combative." 

Santorum endorsed Sen. Marco RubioMarco Antonio RubioGOP lawmakers request Cuba meeting with Biden Bipartisan congressional commission urges IOC to postpone, relocate Beijing Games Hillicon Valley: Democrats introduce bill to hold platforms accountable for misinformation during health crises | Website outages hit Olympics, Amazon and major banks MORE (R-Fla.) shortly after suspending his own presidential campaign in February. But he then endorsed Trump in May after Rubio dropped out. 

Now he says Trump, the presumptive GOP presidential nominee, is a good businessman and would be constructive in the White House. 

"He knows how to put the deal together. And I think he'd be a — he'll be a very constructive figure in the White House."