Mr. Ross’s spokesman has denied that the secretary threatened firings, and Mr. Trump denied that he gave his chief of staff instructions to disavow the forecast.
“I never did that,” Mr. Trump said last month. “That’s a whole hoax by the fake news media. When they talk about the hurricane and when they talk about Florida and they talk about Alabama, that’s just fake news.”
But Neil Jacobs, the acting administrator of NOAA, told congressional investigators that Mr. Mulvaney played a key role, according to Representative Eddie Bernice Johnson, the Texas Democrat who heads the House Science Committee, which is leading one of three separate federal inquiries into the statement.
In a letter this month to Mr. Ross, Ms. Johnson noted that the interview with Mr. Jacobs revealed that top Commerce Department political appointees, not NOAA officials, had drafted the statement and that Mr. Mulvaney was “involved in high-level conversations” about it.
According to Ms. Johnson’s letter, Mr. Jacobs also confirmed a New York Times report that he was first contacted about issuing the statement before dawn on Sept. 6. The Commerce Department officials involved in drafting the letter — David Dewhirst, deputy general counsel; Earl Comstock, director of policy; and Julie Kay Roberts, Mr. Jacobs’ deputy chief of staff and communications director — are all political appointees. None holds a scientific degree.
The episode began the night of Sept. 1 as Dorian gathered strength over the Atlantic and headed toward the East Coast. Mr. Trump wrote on Twitter that Alabama, among other states, “will most likely be hit (much) harder than anticipated.”