Hillary Clinton ignored a question from Fox News Channel's Ed Henry on Monday asking whether she signed a separation statement when she left her job as secretary of state.
If she signed the document, but kept her email on her own private server for two years, she could be guilty of a crime, some observers have argued.
Henry caught up with Clinton walking into an event at a Manhattan hotel.
"Hello, Madame Secretary. Did you sign the separation statement before you left State? Did you sign that statement?" he asked.
Clinton, who was surrounded by staff members, didn't answer. She smiled and waved to Henry and said, "Hi! How are you?"
Story continues below video.
Fox first aired the footage
on "The Real Story with Gretchen Carlson."
State Department Spokeswoman Jen Psaki was asked the same question at Monday's press briefing and didn't answer.
"I don't have an update on this … We're still working on it," Psaki said.
The reporter who asked the question responded: "The human resources department presumably has a file on every employee. It can't be that difficult …"
"I don't think former secretaries are standard employees," Psaki answered.
"They might not be, but how hard can it be to find …" the reporter stated.
"I understand why you're asking. We're looking to get an answer. I don't have an answer today," Psaki said.
Henry, appearing on "Shepard Smith Reporting,"
said it was the third time Psaki has been asked the question in the past week.
"They're going to have to at least say yes or no at some point," Henry said.
The form in question is an OF-109, which all departing State Department employees must sign before leaving. It states that the employee will turn over all work-related documents upon leaving and says that signing the form and not complying with its requirements constitutes a crime.
Former Assistant Deputy U.S. Attorney General Shannen Coffin told Fox News
last week that even secretaries of state are required to sign the document.
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