PHOENIX (AP) — President Donald Trump’s latest campaign stops Tuesday will take him to one of the nation’s biggest hot spots for the coronavirus outbreak.

With cases soaring in Arizona and hospitals growing increasingly crowded with COVID-19 patients, the state has become a leading battleground in the politically charged debate about mask-wearing, which the president has fanned.

Trump is scheduled to visit Yuma to look at the border wall he’s championed before flying to Phoenix to speak at a “Students for Trump” rally. Both cities and counties he’ll visit have ordered people to wear masks in public — a step the president has resisted, even while touring a mask factory during his last stop in Arizona on May 5.

Phoenix Mayor Kate Gallego, a Democrat, said Monday she doesn’t think the president can safely hold his planned event in her city, and called on him to wear a mask.

“Everyone attending tomorrow’s event, particularly any elected official, should set an example to residents by wearing a mask,” Gallego said in a statement. “This includes the President.”