Sen. Bernie Sanders told CNN on Thursday that he felt symptoms weeks ahead of his heart attack that he "should have paid more attention" to, and he will release his medical records "at the appropriate time."

SANDERS: "what I do kick myself a little bit about, and I hope people understand this and hear this, is that I should have paid more attention to some of the symptoms that were occurring. You know, when you do 4 rallies a day and you run all over the country, you get tired, everybody would get tired. But I was more tired than I usually have been, had more trouble sleeping than ordinarily. Occasionally, I would be up there at the podium and I would feel a little bit unsteady. You know, one time I was just lifting, literally holding the mic up to my mouth and my arm hurt. I should have paid more attention to those symptoms. So, I hope that people learn from my mistake."

CNN's SANJAY GUPTA: "It's such an important point, the symptoms you're describing may not be classic sort of symptoms, but left arm pain, some of this stuff were indicators. In retrospect, how long had you had symptoms, Senator?"

SANDERS: "I think, probably, it's hard to say, because, as I said, when you're running around the country, you're tired. What else is new, you're going to be tired. I would say several weeks, anyhow, and I should have paid more attention."

The big picture: Sanders has been recovering from a heart attack that has taken him off the campaign trail. While he originally suggested he would be slowing the pace of his 2020 presidential campaign, he since said he "misspoke," and told Gupta he plans to run a "vigorous campaign."

Go deeper: Bernie Sanders on the issues, in under 500 words

Go deeper

Updated 42 mins ago - Politics & Policy

Tim Scott says Trump "misspoke" when he told Proud Boys to "stand by"

Photo: Bonnie Cash/Pool/AFP via Getty Images

Sen. Tim Scott (R-S.C.) told reporters on Wednesday that he believes President Trump "misspoke" when he told the far-right "Proud Boys" group to "stand back and stand by" in response to a question about condemning white supremacy at the first presidential debate.

Catch up quick: Moderator Chris Wallace asked Trump on Tuesday, "Are you willing, tonight, to condemn white supremacists and militia groups and to say that they need to stand down?" Trump asked who specifically he should condemn, and then responded, "Proud Boys, stand back and stand by. But I'll tell you what, somebody's got to do something about antifa and the left."

Updated 50 mins ago - Politics & Policy

Commission on Presidential Debates wants changes

Photos: Jim Watson and Saul Loeb/AFP via Getty Images

The Commission on Presidential Debates announced Wednesday that it plans to implement changes to rules for the remaining debates, after Tuesday night's head-to-head between Joe Biden and Donald Trump was practically incoherent for most of the night.

What they are saying: "Last night's debate made clear that additional structure should be added to the format of the remaining debates to ensure a more orderly discussion of the issues," the CPD said in a statement.

Trump says he doesn't know who Proud Boys are after telling them to "stand by"

President Trump told reporters on Wednesday that he doesn't know who the Proud Boys are, after saying at the presidential debate last night that the far-right group should "stand back and stand by" in response to a question asking him to condemn white supremacists.

Why it matters: The comments set off outrage and calls for clarification from a number of Republican senators. After being asked several times on Wednesday whether he will condemn white supremacy, Trump responded, "I have always denounced any form — any form of any of that, you have to denounce. But I also — Joe Biden has to say something about antifa."

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