Democratic challenger Adam Hamilton of producing a “defamatory” ad centered on a former patient who was arrested for missing court dates related to unpaid medical debt owed to the Kansas Republican.

In a letter sent to Hamilton, Marshall’s attorneys claimed that the ad released last week by the Kansas Democrat’s campaign contained “false” information and must be taken down.

“We demand that you immediately cease and desist from any further publication, broadcast, distribution, or promotion of the advertisement,” the letter said.

The ad in question features Meischa Zimmerman—a one-time patient of Marshall, a former obstetrician-gynecologist—who was arrested in 2011 after missing a $50 payment.

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