Rep. Matt Cartwright (D-Lackawanna) has found himself in the middle of a misunderstanding with one of his top donors.

Cartwright appeared in TV commercials praising the law firm of Parker Waichman and partner Jerry Parker for their representation of U.S. servicemen and family members affected by widespread water contamination at Marine Corps Base Camp Lejeune in North Carolina.

The Democrat authored the just-signed Camp Lejeune Justice Act that allows servicemen and family members affected by the contamination to sue the federal government for damages.

Parker Waichman used clips of Cartwright saying, “Jerry Parker introduced me to this whole problem. I owe Jerry Parker a great debt of gratitude.” The ads were placed in an attempt to seek additional plaintiffs in Camp Lejeune litigation.

Members of Congress are prohibited from using official resources to promote commercial endeavors. Cartwright can be seen in the video wearing his official Congressional lapel pin.

Cartwright’s office quickly sent a cease-and-desist letter to the law firm to remove the ads. In response to the letter, Parker apologized for “any trouble this has caused you. In retrospect, we see that this was an overreach: you never authorized our use of your comments for advertising. We took it all down as soon as we realized our error.” A pair of pages on Parker Waichman’s website featuring the Cartwright videos have since been removed.

According to Axios, Parker and his wife have donated the legal maximum to Cartwright’s campaign in each of the last four election cyclesD