The latest Morning Consult poll reveals widespread concern among voters about Hillary Clinton’s health, with a quarter of voters saying the issue will make them less likely to vote for her.

The survey, which was taken after the secretary of state was seen being helped into a van after a medical episode, reveals that 79 percent of those surveyed have heard concerns about Clinton’s health.

Half of the people surveyed said that Clinton’s health won’t influence their vote, but 25 percent said they’re less likely to vote for Clinton because of her issues. Forty-four percent said they think Clinton’s health will change her ability to serve and 50 percent of those surveyed believe Clinton has given false information on her health.

Seventy-one percent of voters believe presidential candidates should provide a medical release letter from a doctor, while 78 percent think the same should be done concerning mental health.

If for some reason Donald Trump or Clinton were unable to serve their terms, voters say Trump’s running mate Indiana Gov. Mike Pence is more prepared to be president than Clinton’s running mate Sen. Tim Kaine, 43 percent to 38 percent.

The poll was taken Sept. 12 to Sept. 13 with 1,501 registered voters and has a plus or minus 3 percent margin of error.