Hillary Clinton defended herself Monday over her campaign's delay in announcing her pneumonia diagnosis, saying she's "already met a high standard of transparency" while looking forward to returning to the campaign trail.

The Democratic presidential nominee told CNN in a phone interview she did feel dizzy and lost her balance while attending a 9/11 commemoration ceremony in New York, but now is "feeling so much better." 

"I was supposed to rest five days, that's what they told me on Friday, and I didn't follow that very wise advice," Clinton said. 

She told CNN her campaign didn't make her diagnosis on Friday public because "I just didn't think it was going to be that big a deal" 

"I thought that I could just keep going forward and power through it, and obviously that didn't work out so well," she said.

When asked about her husband's comments in an interview with Charlie Rose to be aired on CBS and PBS that she occasionally has become dehydrated and gone through similar medical episodes in the past, Clinton said it is "something that has occurred a few times over the course of my life." 

"What happened yesterday was that I just was incredibly committed to being at the memorial, as a senator on 9/11, this is incredibly personal to me," she told CNN. 

"I could feel how hot and humid it was. I felt overheated. I decided that I did need to leave, and as soon as I got into the air conditioned van, I cooled off, I got some water, and very quickly, I felt better," she said.

She added that now she is taking her doctor's advice "to just take some time to get over pneumonia completely."

As she is taking time off, Bill Clinton will host fundraisers and at least one campaign event while his wife recovers.

The former president will headline two fundraising events Tuesday in Los Angeles and a campaign event Wednesday in Las Vegas, Fox News learned Monday.

Hillary Clinton did call into a fundraiser event Monday night in San Francisco after she took to social media earlier in the day to give an update on her health. 

“Thanks to everyone who’s reached out with well wishes!,” Clinton tweeted Monday afternoon. “I’m feeling fine and getting better.”

The incident Sunday -- in which Clinton appeared unsteady and needing assistance from aides -- has resulted in her and Republican rival Donald Trump each planning to release more personal health information.

The 70-year-old Trump said Monday that candidate health is now an “issue” in the White House race.

Clinton spokesman Brian Fallon said on MSNBC that the campaign will release more information in the next couple days.

Trump told Fox News’ “Fox & Friends” earlier Monday morning that he’ll be releasing “very, very specific” details from a recent physical.

“I think they’re going to be good. I feel great,” he said. Fox News has learned Trump plans to release those details during his appearance Thursday on “The Dr. Oz Show.”

As for Clinton’s health, Trump said: “Something’s going on, but I just hope she gets well and gets back on the trail.”

Clinton, 68, is resting at her home in Chappaqua, N.Y.

Her doctor revealed she had been diagnosed Friday with pneumonia, after the episode at the 9/11 memorial, in which Clinton was also seen stumbling on her way to her van when leaving.

Clinton’s doctor also said she had become “overheated and dehydrated” at Sunday’s ceremony, but is “recovering nicely.”

The incident fueled questions about Clinton’s health. Trump on Monday brushed aside any speculation that Clinton might be replaced as the Democratic nominee, but said of the candidate’s health: “I think it’s an issue.”

Trump, meanwhile, continued to criticize Clinton for saying -- before her health episode -- that half of his supporters fall into a “basket of deplorables.” Clinton has expressed regret for the remarks, but Trump said, “I think this is the biggest mistake of the political season.”

Even before Monday’s comments, Trump already had said both candidates should release detailed medical records.

Clinton’s campaign earlier released a July 2015 letter from Dr. Lisa Bardack describing Clinton as “a healthy 67-year-old female whose current medical conditions include hypothyroidism and seasonal pollen allergies.” The letter noted her elbow fracture in 2009 and concussion in 2012. Bardack detailed how Clinton had to undergo “anticoagulation therapy” to dissolve a clot, and experienced “double vision for a period of time,” after the concussion.

But the campaign has not released detailed records beyond that.

Former President Obama adviser David Axelrod rapped Clinton Monday on her "penchant for privacy."

Fox News’ Jennifer Griffin and John Roberts and The Associated Press contributed to this report.