The leader of Saudi Arabia promised President Donald Trump that he can raise oil production if needed and the country has 2 million barrels per day of spare capacity, the White House said on Saturday, rowing back on an earlier Trump tweet that appeared to suggest the Saudis had agreed to boost output by that amount.

Trump told King Salman bin Abdul-Aziz al-Saud that the oil market could need more supply when the men spoke on Friday, the White House said. The Saudi leader said he was ready to raise output if needed, the White House said in a statement.

"King Salman affirmed that the Kingdom maintains a two million barrel per day spare capacity, which it will prudently use if and when necessary to ensure market balance," read the statement.