Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) denied on Wednesday that his campaign had not been transparent about his heart attack last week, saying the suggestion itself is "nonsense."

"That's nonsense," Sanders told NBC News. "I don't know what people think campaigns are, you know we're dealing with all kinds of doctors and we wanted to have a sense of what the hell was going on really."

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Sanders, 78, suffered a heart attack last week in Las Vegas, which led his campaign to cancel his events until further notice. He left the hospital on Friday after having two stents placed in a blocked coronary artery.

He said on Tuesday that he plans to slow down his pace on the presidential campaign to make sure "make sure that I have the strength to do what I have to do."

However, Sanders told NBC News on Wednesday that he misspoke when he said he was going to scale back his activities on the campaign trail.

"I misspoke the other day. I said a word I should not have said and media drives me a little bit nuts to make a big deal about it," Sanders said. "We're going to get back into the groove of a very vigorous campaign, I love doing rallies and I love doing town meetings.”

His campaign has confirmed that he will participate in the Oct. 15 Democratic debate in Westerville, Ohio.

Sanders's hospitalization has brought newfound attention on the issue of age and health on the presidential campaign trail. Biden and other top Democratic candidates Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE are all in their 70s. President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is 73.