National Economic Council Director Gary Cohn resigned on Tuesday after a dispute in the White House over steel and aluminum tariffs.

Cohn had reportedly opposed the tariffs that Trump announced last week on imported steel and aluminum and had been working to assure U.S. allies in recent days that their concerns would be addressed. Earlier Tuesday, Trump said he intends to move forward with the tariffs. Cohn's departure is the latest in a string of exits by top officials in the Trump White House.