Democratic strategist David Axelrod wants Hillary ClintonHillary Diane Rodham ClintonThe Memo: Centrists change tone of Democratic race In 2020, democracy will be decided at the margins Michelle Obama presents Lin-Manuel Miranda with National Portrait Award MORE to focus on transparency, saying her "vulnerability is not health, it’s stealth.” 

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“What she did, I think, in trying to navigate through questions about her health, she created more questions on the other side, which is really a greater vulnerability," he told hosts Alisyn Camerota and Chris Cuomo on CNN’s “New Day” Wednesday. "From my standpoint, I said it was ill-considered, and I said so.”

Videos emerged last Sunday showing Clinton stumbling as she left a 9/11 memorial early after feeling “overheated.”

Clinton’s doctor then disclosed later that evening the Democratic presidential nominee was diagnosed with pneumonia last Friday.

Axelrod on Monday tweeted that Clinton has an "unhealthy penchant for privacy that repeatedly creates unnecessary problems."

On Wednesday, he said Clinton’s illness will not slow her down. 

“First of all, let me say on her health, I’ve seen her close up as an opponent when I was working for Barack ObamaBarack Hussein ObamaThe Memo: Centrists change tone of Democratic race Political purity tests are for losers Deportations lower under Trump administration than Obama: report MORE in 2008,” said Axelrod, a chief strategist for both of Obama’s presidential campaigns.

“As someone who worked side-by-side with her in earlier years and when she was secretary of State, she is a relentless, indefatigable, tenacious human being,” added Axelrod, who also served as a White House senior adviser to Obama.

“I have no doubt about that. And so I’ll suspect she’ll come back on the campaign trail ... full of piss and vinegar, as the expression goes.”

Some of Clinton’s allies worry her penchant for privacy may fuel conspiracy theories about her physical condition.

Donald TrumpDonald John TrumpMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Judge orders Democrats to give notice if they request Trump's NY tax returns Trump's doctor issues letter addressing 'speculation' about visit to Walter Reed MORE, the GOP’s presidential nominee, has frequently accused Clinton of lacking the strength and stamina for the Oval Office.