He said the tweets, after Trump on Sunday approved a federal disaster declaration requested by Governor Jerry Brown for the fires, sparked a barrage of media queries to CalFire. "Must also tree clear to stop fire spreading!" "Can be used for fires, farming and everything else".
Elsewhere in California, evacuations were ordered for cabins in Cleveland National Forest canyons in Orange County on Monday afternoon after a blaze broke out and quickly spread to blacken some 700 acres (283 hectares).
More than 14,000 firefighters are fighting various fires across the north west of the US. The two fires, which have threatened more than 9,000 structures, have not merged, but officials are counting them as one.
Environmentalists and some politicians say the uptick in the intensity of the state's wildfire season may be linked in part to climate change.
The twin wildfires, collectively known as the Mendocino Complex Fire, have together more than doubled in size in just the past four days and burned through 273,664 acres or 427 square miles of parched land - an area nearly the size of Los Angeles.More news: Newcastle players shun media in dispute with club over bonuses
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Another major fire also burning in Northern California, the Ferguson Fire, extended into its third week.
Farther north in Shasta County, the devastating Carr Fire claimed its seventh victim Saturday when a Pacific Gas & Electric worker died while working with a crew to restore power, utility spokesman J.D. Guidi said. "That's what we're trying to prevent", Austin said. Fire agencies haven't been complaining about a lack of water, especially water "diverted" to the Pacific.
Trump seemed to be referring to proposals by some California Republicans to expand the Shasta Dam, located near the heart of the Carr Fire.
"The fire is continuing to progress into some really ugly country up here, so the only option is to go direct and try and cut it off before it gets to Lake Pillsbury, and we're having success building line (around Pine Mountain) and we think we're looking OK up there".
Emily Carlin, spokeswoman for Rep. Jeff Denham, a California Republican and almond farmer who is one of the most vocal in the calls for more water for farms, said Monday she didn't know of her boss raising any argument about scanty water for firefighting.
While containment grew to 47 percent, burned acreage grew over the weekend, as well, now sitting at 164,413 acres burned.
Another blaze that ignited last week has damaged a historic Northern California resort in the Stanislaus National Forest.