Oil futures ended lower on Tuesday as traders weighed prospects for crude supplies after President Donald Trump vowed to boost already record U.S. crude output, threatened to implement a steep tariff on Canadian imports and called for replenishing the Strategic Petroleum Reserve.

Donald Trump declared an “energy emergency” on Monday and signed a flurry of related executive orders. Some are designed to boost oil drilling, and others rescind or stall clean energy rules from the Biden administration.

Oil prices rose for the fourth consecutive week due to supply concerns and uncertainty over energy policies from the incoming president.