Arizona Attorney General Mark Brnovich sent a cease-and-desist letter on Thursday to an air-purification firm and the Phoenix megachurch that hosted Trump's visit this week, demanding they stop making fraudulent statements about preventing COVID-19.

Before Trump's June 23 visit, Dream City Church leaders Luke Barnett and Brendon Zastrow brought national attention to the firm Clean Air EXP when they made a video claiming their new air system would get rid of the novel coronavirus and make it safe to visit their 3,000-seat auditorium.

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Brnovich, in a release today about the cease-and-desist letter, said Clean Air EXP "has advertised and continues to advertise" that it can "neutralize COVID-19," yet his office "is aware of no scientific research or public health authority certifying any kind of treatment product as a means of preventing COVID-19 infections."

A similar warning and cease-and-desist letter also went to Dream City Church, the AG's Office said.