Greeted by Gov. Gavin Newsom, President Trump landed in Los Angeles Friday afternoon to survey the devastation from the firestorms that swept through L.A. County. It was his first presidential visit since taking office — and a potentially contested one after his repeated threats to withhold federal aid to California.

The fires, which began on Jan. 7 and are still not fully contained, have killed 28 people and damaged or destroyed nearly 16,000 structures. The rain will bring cleaner air and improve fire-fighting conditions, but some authorities have expressed concern that overall rain will make things worse.

Los Angeles is forecast to receive desperately needed rain this weekend, providing relief to first responders battling four active fires in the region while also creating the risk of new hazards including mudslides,