We'll review the facts on what causes California's fires, and rate Trump's latest claim.
It was not immediately clear, however, whether Trump's threat was bluster like other tweets he has sent falsely criticising California's fire management, or if he has actually ordered a funding cutoff to thousands of Californians trying to rebuild after the two devastating fires that hit the state late past year.
"The president's message shows clear frustration about an important issue that has not been resolved - how we deal with addressing wildfires in California going forward so that more lives aren't at risk", said Mr. McCarthy, who represents a Central Valley district.
FEMA is part of the Department of Homeland Security, whose operations are affected by the partial government shutdown, which entered its 19th day on Wednesday.
The congressman added, however, "the immediate problem for fire victims is the first need, and threats to FEMA funding are not helpful and will not solve the longer term forest management regulatory problems". Dianne Feinstein said, "It's absolutely shocking for President Trump to suggest he would deny disaster assistance to communities destroyed by wildfire".
Governor Gavin Newsom said 167 people have been killed by fires and floods over that time. "We have been put in office by the voters to get things done, not to play games with lives".
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The Dow rallied by 602.29 points, or 2.65 percent, to reach 23,288.51 an hour after the United States stock market opened. Only 10 companies on the S&P 500 fell, and 90 per cent of the stocks on the New York Stock Exchange traded higher.
California plans to spend $1bn on forest management over the next five years, the letter said, and has spent $111.3m since 2017, just under half on federal lands.
It's possible Trump could follow through on his threat by closing recovery centers in California or slowing the bureaucratic process by which public assistance and individual assistance is transmitted to the state, Lemaitre said.
The White House did not immediately respond to a request for clarification on the intent of the president's tweet. "Attacking victims is yet another low for this president".
The Federal Emergency Management Agency has been providing millions of dollars in disaster aid to wildfire survivors, including in and around Paradise, California, where 86 people died in this fall's Camp Fire. Many California wildfires are in non-forested areas.
On Tuesday, Newsom proposed US$305 million (NZ$448 million) to remove thousands of acres of forests and brush, expand emergency crews and modernise California's 911 systems.
Newsom noted that he had joined Oregon Governor Kate Brown and Washington state Governor Jay Inslee in writing a letter to the federal government earlier this week asking for an improved partnership in "taking on these unprecedented wildfires".
The president claims that the state is not properly managing their land, unlike Finland, where they rake the forest floor-at least according to Trump.
LaMalfa previous year survived the "blue wave" that swamped so many other Republicans, although he won his district by just ten points, a steep drop from his 18-point victory in 2016 and his 22-point victory in 2014.