The rare request came after U.S. retail gasoline prices surged to their highest in more than three years and President Donald Trump publicly complained about OPEC policy and rising oil prices on Twitter. It also follows Washington's decision to reimpose sanctions on Iran's crude exports that had previously displaced about 1 million barrels a day, or just over 1 percent of global production.

While U.S. lawmakers have habitually criticized the Organization of Petroleum Exporting Countries at times of high oil prices, and the government has on occasion encouraged the cartel to pump more, it's unusual for Washington to ask for a specific output hike, the same people said, asking not to be named discussing private conversations. It's not clear precisely how the request was communicated.

Raising production was discussed at a meeting of some Arab oil ministers over the weekend in Kuwait City. A statement published after the talks pledged to "ensure stable oil supplies are made available in a timely manner to meet growing demand and offset declines in some parts of the world." Saudi Arabia and Russia last month proposed a gradual production increase, although other members of the group have yet to agree.