Donald Trump stated on September 22 that he has internally called for a ban on diesel exports, adding that a decision on whether to implement the ban would be made "soon." U.S. Treasury Secretary Scott Bessent confirmed that the administration is evaluating the feasibility of a full or partial ban. This news put pressure on the refining sector, with Jefferies downgrading Valero Energy and Marathon Petroleum to Hold on the same day. Valero's stock price fell over 4%, and Marathon's dropped more than 3%.