President Donald Trump is threatening to stop federal payments to California, claiming its forest management is "so poor".
President Trump said "there is no reason for these massive, deadly and costly fires in California".
The president said that "billions of dollars are given each year, with so many lives lost, all because of gross mismanagement of the forests. Remedy now, or no more Fed payments".
The comments were President Trump's first about massive wildfires, including a blaze that incinerated most of the Northern California town of Paradise and killed at least nine people.
Wildfires also raged in Southern California, including the town of Thousand Oaks, where a gunman days earlier killed a dozen people at a local bar.
President Trump earlier issued an emergency declaration providing federal funds to help firefighters.