After footage surfaced of Hillary Clinton struggling to walk and nearly collapsing at the 9/11 memorial service, her health has become a serious concern for voters. Now, new emails released from WikiLeaks showing her top aide Huma Abedin making cryptic comments about Clinton’s head might sow even more seeds of doubt about the Democratic nominee’s fitness to be president.

Just days after Clinton kicked off her campaign in April 2015, Abedin made a curious remark in an email thread related to Jeb Bush’s use of super PACs.

Joel Benenson replied to the group of Clinton staffers that her response to Jeb’s tactics should be something more than “I am very concerned.”

“I will leave commenting on campaign tactics to others. What I have made absolutely clear is that corporate money and secret money have no place in our democracy and we should get rid of it once and for all,” he wrote, suggesting a better response.

Huma replied, “She’s going to stick to notes a little closer this am, still not perfect in her head.”

And that’s not the only time Clinton’s head came up in the leaked emails.

In September of that same year, Podesta wrote to Communications Director Jennifer Palmieri to ask: 'How bad is her head?' in an email with the subject line 'Any sense of whether and when she wants to talk?' Don't know,' Palmieri replied. 'Huma left here about an hour ago. I just pinged again to ask about prep, haven't heard back.' The emails suggest that Clinton's health was a frequent topic of concern since she suffered a concussion and 'cracked head' during a fall in December 2012. Doctors discovered a blood clot in her head during examinations and Clinton was forced to take a month's absence to recover. By 2013, her doctors said that her treatment was successful and she'd had a'complete resolution' to the episode. But the latest Wikileaks dump appear to show that her aides were still concerned.

Trump has repeatedly questioned Clinton’s health and stamina on the campaign trail, even making it the subject of one of his ads.