The head of the U.S. agency that warns of dangerous weather violated its policy on scientific integrity with a statement last year backing a tweeted forecast by President Donald Trump about the path of a hurricane, according to a report released Monday.

Trump wrote on Twitter on Sept. 1 that Alabama would be among U.S. states that would "most likely be hit (much) harder than anticipated" by Hurricane Dorian, then one of the most powerful Atlantic storms on record.

Within minutes, the National Weather Service office in Birmingham, Alabama, responded by saying that Alabama would not see any impacts from Dorian.