ABC's Karl: Clinton's lack of transparency on health 'borderline deception'
© Greg Nash

ABC's chief White House correspondent, Jonathan Karl, says Hillary ClintonHillary Diane Rodham ClintonGOP political operatives indicted over illegal campaign contribution from Russian national in 2016 Clinton lawyer's indictment reveals 'bag of tricks' Attorney charged in Durham investigation pleads not guilty MORE's initial decision to not reveal she was suffering from pneumonia was "borderline deception."

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Appearing on ABC Monday, Karl predicted that polls asking about Clinton's trustworthiness would take a big hit after the medical episode on Sunday in New York that has led to widespread speculation about her overall health.

"This is her biggest vulnerability as a presidential candidate, that voters simply do not trust her," Karl said. "Those are remarkable numbers for both candidates. You have roughly a third saying they trust her. Two-thirds suggesting not."

A recent ABC News/Washington Post poll showed 35 percent of Americans find the Democratic presidential nominee honest and trustworthy. Only 31 percent in the same poll find her opponent, Donald TrumpDonald TrumpTrump takes shot at new GOP candidate in Ohio over Cleveland nickname GOP political operatives indicted over illegal campaign contribution from Russian national in 2016 On The Money — Dems dare GOP to vote for shutdown, default MORE, honest and trustworthy.

"If you can't trust her about how she feels, what can you trust her about?" Karl asked. "This was not simply a lack of transparency yesterday, this was borderline deception."

Karl then blasted the campaign for its lack of candor with the public.

"They said simply that she was overheated. They said that she was feeling fine. Then you find out she had been diagnosed with pneumonia," Karl said.

"Not a good day on the transparency front."

The Clinton campaign said the 68-year-old candidate will be resting for the next two days instead of flying to fundraising events in California.