California, Oregon

Fire officials from both states say no engines were prevented from entering California and none of the vehicles underwent any emissions testing.
A Jan. 11 Facebook post (direct link, archive link) claims California prevented some out-of-state fire engines from coming into the state to help fight its deadly wildfires. “Oregon sent 60 ...
Fire trucks traveling from Oregon and other states to help fight the California wildfires were stopped for routine 15-minute safety checks, not emissions testing.
President Donald Trump said Monday that he ordered the U.S. military to divert water from the Pacific Northwest to Southern ...