Alabama, Trump declared on Twitter, was among the states that could be hit by Hurricane Dorian, which is approaching Florida’s Atlantic coast. The statement was promptly refuted by the National Weather Service in Birmingham, the National Oceanic and Atmospheric Administration and others saying that Alabama is not expected to be affected—yet Trump repeated his claim.

The president’s insistence might have surprised weather forecasters, but it’s far from the first time he’s waded into a debate by immediately high-handing the experts. In the course of his presidency, Trump has claimed detailed knowledge about topics as wide-ranging as drones, forest management, horse track conditions and technology.

We’ve combed Trump’s Twitter feed, interviews and other public statements since he took office. What follows is only a sampling of the striking list of things on which the president is, by his own account, an expert.