WATCH LIVE: Todd Akin debates Claire McCaskill

On Monday, Charlie Kirk, the founder of the pro-Trump Turning Point USA student group, tore into Gov. Doug Ducey (R-AZ) over Arizona State University requiring vaccines for students, calling the measure "unconstitutional."

"Why is the Republican Governor of Arizona allowing @ASU — the largest university in his state — to unconstitutionally mandate vaccines for college students?" tweeted Kirk. "This is a brazen attack on liberty and a dangerously anti-scientific position for a university to take Unacceptable."

On Monday, Arizona Attorney General and Republican Senate candidate Mark Brnovich fired off an angry letter to Attorney General Merrick Garland for his criticism of the Arizona election "audit," calling the DOJ's position against the effort "hysterical," and saying he is "not amused by DOJ posturing."

The letter invited immediate scorn from local Arizona reporter Brahm Resnik, who noted that ironically, the entire letter "gives a posturing clinic."

A man pulled out a gun and shot and killed an Atlanta-area Big Bear Supermarket cashier over the store's mask policy, according to police. Two people, including a DeKalb County Sheriff's Office reserve unit deputy who was inside the supermarket working as a security guard, and the suspect, were also wounded.

"The subject pulled out a weapon and shot a cashier at the location," DeKalb County Sheriff Melody Maddox said, according to 11Alive. "The individual is deceased."