Democratic presidential nominee Joe Biden on Monday called President Donald Trump a “climate arsonist” for failing to acknowledge the role of global warming in the Western US wildfires, while Trump said forest management was the key to controlling the blazes.

Wildfires across Oregon, California and Washington state have destroyed thousands of houses and a half-dozen small towns since August, scorching more than four million acres (1.6 million hectares) and killing 35 people in the three states...