Oil prices resumed their downward slide after the OPEC+ cartel of oil producers said over the weekend that it would pump more oil, even though analysts say demand could fall if President Donald Trump’s trade war curbs economic growth.

The U.S. benchmark oil price settled at $57.13 a barrel Monday, the lowest level in more than four years and down more than 25% since just before Trump took office.

Trump has said he would lower energy costs for Americans and called for increased drilling. But for many oil and gas executives in the United States, who were big donors to the president’s campaign, the steady price decline means it will not be profitable to drill new wells.

The leaders of OPEC+ appear to be making a calculated decision to raise production even if that lowers prices — and, thus, how much money they make from selling oil — for geopolitical reasons. They want to punish cartel members that have been producing more than the quotas they agreed to, analysts said. The cartel’s de facto leader, Saudi Arabia, also wants to strengthen its ties to Trump, according to energy experts.

Prices briefly fell to around $55 a barrel in early April, just before Trump said he would pause reciprocal tariffs on most countries for 90 days. That announcement led to rallies in the stock and oil markets, though oil prices have since waned.

That is partly because OPEC+ is raising output at the same time that economists are warning that higher tariffs on most American trading partners will slow global economic growth and potentially cause a recession in the United States.

The countries that make up OPEC+ said Saturday that they would further ramp up production in June.

The oil cartel had agreed to production cuts as a way to bolster prices, but analysts said Saudi Arabia has grown weary of pumping less oil while other countries, such as Kazakhstan and Iraq, surpass their production quotas.

The increased production may also be a sop to Trump, who has pushed producers to pump more oil to lower prices. The president is expected to travel to Saudi Arabia and other countries in the Middle East soon.