Sen. Bernie Sanders (I-VT) said he will convince Democrat voters – who are concerned about his health following his recent heart attack – that he is up for the stress of the presidency by mounting a “vigorous campaign” all over the country.

“You’re 78 years old and you just had a heart attack,” CNN’s Erin Burnett stated. “How can you reassure Democratic voters that you’re up to the stress of the presidency?”

Sanders responded by announcing a “major rally” in Queens and teased an appearance from a “special guest”– possibly Rep. Alexandria Ocasio-Cortez (D-NY), who was spotted dining with the socialist senator in Burlington, Vermont, last month.

“Well, let me all invite you to a major rally we’re having in Queens, New York. Bernie Sanders.com. We’re going to have a special guest at the event, and we are going to be mounting a vigorous campaign all over this country,” Sanders said.

“That is how I think I can reassure the American people,” he continued, thanking people for their support following his health scare.

“Let me take this moment, if I might, to thank so many people all over this country – including many of my colleagues up here – for their love, for their prayers, for their well-wishes,” Sanders said.

“I just want to thank you from the bottom of my heart, and I’m so happy to be back with you this evening,” he added.