Senator Bernie Sanders was released from the hospital on Friday, but campaign events are still canceled until further notice. His physicians, Arturo E. Marchand Jr.and Arjun Gururaj, confirmed in a statement that Sanders suffered from a heart attack.

“His hospital course was uneventful with good expected progress. He was discharged with instructions to follow up with his personal physician,” they said. Sanders, 78, was spotted by cameras leaving the Desert Springs Hospital Medical Center in Las Vegas, with his campaign releasing a statement from the Vermont senator thanking doctors and staff for treating him for a blocked artery. “I want to thank the doctors, nurses, and staff at the Desert Springs Hospital Medical Center for the excellent care that they provided. After two and a half days in the hospital, I feel great, and after taking a short time off, I look forward to getting back to work,” he said.

Sanders is expected to return to his home in Burlington, Vermont.

Bernie Sanders has just been released from a Las Vegas hospital pic.twitter.com/bGMRZLnUyc — Steve Brusk (@stevebruskCNN) October 4, 2019

While campaign events are on hold, Sanders is expected to be at the next Democratic debate on October 15. Even if he is able to make it to the debate, this incident will certainly raise doubts over his ability to handle the rigors of a presidential campaign. Donors and supporters will certainly be questioning whether he is physically capable of not only campaigning for president but actually handling the stress of being the president. The next few weeks will be crucial for him and his campaign.

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Matt Margolis is the author of Trumping Obama: How President Trump Saved Us From Barack Obama’s Legacy and the bestselling book The Worst President in History: The Legacy of Barack Obama. You can follow Matt on Twitter @MattMargolis