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“OPEC decisions by no means warrant any action by some of its member countries in pursuit of the call for production increase by U.S., politically motivated against Iran,” Zanganeh wrote. “As we are all in agreement to depoliticize our efforts in the OPEC, we should not let others take politicized measures targeting OPEC’s unity and independence.”

Members of the Organization of the Petroleum Exporting Countries cartel led by Saudi Arabia and non-cartel members agreed this month to pump 1 million barrels more crude oil per day, a move that should help contain the recent rise in global energy prices.

But on Saturday, Trump wrote on Twitter that he had received assurances from King Salman of Saudi Arabia that the kingdom will increase oil production, “maybe up to 2,000,000 barrels” in response to turmoil in Iran and Venezuela.

Saudi Arabia acknowledged the call took place, but mentioned no production targets. Saudi Arabia currently produces some 10 million barrels of crude oil a day. Its record is 10.72 million barrels a day

In a statement issued Saturday night, the White House seemed to walk back Trump’s tweet.

“King Salman affirmed that the kingdom maintains a 2-million-barrel-per-day spare capacity, which it will prudently use if and when necessary to ensure market balance and stability, and in co-ordination with its producer partners, to respond to any eventuality,” the statement said.

Oil prices have edged higher as the Trump administration has pushed allies to end all purchases of oil from Iran following the U.S. pulling out of the 2015 nuclear deal. Prices also have risen with ongoing unrest in Venezuela and fighting in Libya over control of that country’s oil infrastructure.