Democratic strategist David Axelrod wants Hillary ClintonHillary Diane Rodham ClintonThe Hill's 12:30 Report - Third vaccine candidate with 90% efficacy Biden won — so why did Trump's popularity hit its highest point ever? The Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - Calls mount to start transition as Biden readies Cabinet picks 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 ObamaCentral Asia is changing: the Biden administration should pay close attention MSNBC to debut docuseries 'Obama' Can Biden vanquish Democrats' old, debilitating ghosts? 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 TrumpBiden team wants to understand Trump effort to 'hollow out government agencies' Trump's remaking of the judicial system Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit MORE, the GOP’s presidential nominee, has frequently accused Clinton of lacking the strength and stamina for the Oval Office.