Eliza Collins

USA TODAY

NEW YORK — The Clinton campaign is acknowledging their handling of the Democratic presidential nominee's health episode Sunday could have been "better" and announced that more medical information would be released this week.

Campaign spokesman Brian Fallon, speaking with MSNBC on Monday, said that additional details about Hillary Clinton's health status would be made public "in the next few days" but that there was "no other undisclosed condition." On Sunday, the campaign released a statement from Clinton's doctor stating that the candidate had been diagnosed with pneumonia on Friday.

On CNN Monday, Fallon said that Clinton was not contagious and defended the campaign's decision not to share her diagnosis on Friday because “it was her intent to press on and not let pneumonia affect her."

However, he did acknowledge that after the health incident on Sunday “we should have provided more information more quickly."

Jennifer Palmieri, Clinton's communications director, also said the campaign "could have done better" with its handling of the health episode in response to a Twitter message from Obama strategist David Axelrod, in which he hit Clinton for "an unhealthy penchant for privacy." Palmieri also tweeted that Clinton's Republican opponent, Donald Trump, was "less transparent than any nominee in modern history."

On Sunday, Clinton attended the 9/11 memorial ceremony at Ground Zero but left around 9:30 a.m. ET because she was feeling unwell. Video from outside the event appeared to show Clinton's knees buckling as she got into her van.

The press traveling with Clinton remained inside the event for nearly an hour and a half without any information about what was happening after she left. A statement at 11 a.m. said that Clinton left after feeling “overheated.”

Clinton’s traveling press saw Clinton leave daughter Chelsea Clinton's apartment — where she had been resting — and get into her van to head back home to Chappaqua, N.Y., around 11:45 a.m. But there was no more information given, besides confirmation that she had arrived home nearly two hours after leaving her daughter's, until after 5 p.m.

At that point, the campaign said Clinton had been diagnosed with pneumonia on Friday and put on antibiotics.

“While at this morning's event, she became overheated and dehydrated. I have just examined her and she is now re-hydrated and recovering nicely,” Clinton’s physician, Dr. Lisa R. Bardack, said in a statement.

Five more hours passed before the campaign announced it would, in fact, be canceling Clinton’s trip to California on Monday.

Clinton on Monday wrote on Twitter that she was "feeling fine and getting better."

"Like anyone who’s ever been home sick from work, I’m just anxious to get back out there," she said in another message. "See you on the trail soon."

The Trump campaign has jumped on the Clinton team for its lack of transparency. Trump’s campaign manager, Kellyanne Conway, even tweeted out her kudos to Axelrod’s statement Monday.

Later, Conway tried to hit the Clinton campaign for a “theme” of transparency issues.

However, Trump was also at the memorial in New York on Sunday, and the campaign did not coordinate with his press pool so that they could attend. Recently, the campaign left the pool in Arizona while Trump went to meet with the president of Mexico in Mexico City.

Trump has also refused to release his tax returns, something all other presidential candidates in recent history have done. On Monday, he promised to release results of his recent medical examination soon. So far during the campaign, Trump has released just a four-paragraph letter attesting to the candidate's good health that his doctor said he wrote in five minutes.

White House press secretary Josh Earnest on Monday said it’s up to the candidates to make their own decisions about how and when to release medical information. But he said President Obama’s position is that candidates for the highest office should be open about their health.

“Obviously, the requirement that the American people have some understanding of the health of their president is a pretty common-sense proposition,” he said.

As for the current president, Earnest said there’s been no material change in President Obama’s medical condition since his last physical in February, when the White House doctor pronounced his health to be “excellent.”

Contributing: Gregory Korte

For Hillary Clinton, some terrible horrible, no good, very bad days