Neither Saudi Arabia's energy minister nor OPEC's secretary general discussed lowering oil prices with President Donald Trump, sources told the Wall Street Journal, denying the U.S. leader's earlier claim.

Moments after the Journal reported the denials, Trump took to Twitter to double down on his earlier remark.

"Spoke to Saudi Arabia and others about increasing oil flow. All are in agreement," the president tweeted.

Tweet.

Earlier on Friday, Trump told reporters he had "called up" OPEC and urged the producer group to take action to bring down fuel costs.

"I called up OPEC. I said, 'You've got to bring them down. You've got to bring them down,' and gasoline's coming down," Trump said, inaccurately stating that gasoline prices are falling.

Oil prices tumbled more than 4% following Trump's comment.

When the president made the remarks, it was not clear whether Trump meant that he had contacted the OPEC Secretariat in Vienna, or whether he was referring to OPEC members like Saudi Arabia and the United Arab Emirates, which are close U.S. allies.