"The United States must not launch an offensive war against Iran without congressional approval", said Democratic Representative Ro Khanna. The US President Donald Trump took it to Twitter in response to the matter questioning Iran's denial of the blames.
Iran-supported Huthi rebels - who are fighting a Saudi-led coalition in Yemen - claimed the strikes.
Russia, a leading Iranian ally in the Middle East, called on countries not to rush to conclusions over who was responsible, Kremlin spokesman Dmitry Peskov said. We uplifted oil (from Saudi Arabia) yesterday (September 16) and even today (September 17)", he said. The US already has the USS Abraham Lincoln aircraft carrier battle group in the area, as well as fighter jets, bombers, reconnaissance aircraft and air defenses.
"What the photos indicate is that someone planned a sophisticated, coordinated attack that really impacted the production of oil at this facility", he said.
Details of September 14's strikes on Abqaiq - the world's largest oil processing facility - and the Khurais oil field in eastern Saudi Arabia remained unclear, but left crude oil output by the world's top exporter slashed in half.
Saudi Aramco has informed at least six refiners in Asia that it will supply full allocated volumes of crude oil in October following attacks on Saudi oil facilities on the weekend, although at least one has been told of a grade switch partially.
On Monday, the prices surged nearly 20 per cent in intraday trading in response to the attacks, the biggest jump in almost 30 years, before closing nearly 15 per cent higher at four-month highs.
Bohnen is optimistic prices will stabilize because of the United States' lack of dependence on Saudi oil.
Riyadh said it would meet oil customers' demand from its ample storage.
Aramco, the world's largest oil company, is preparing for an initial public offering, although some investors and analysts think it may be delayed as it has not said when oil output will be restored.
"The market's reaction to Saudi Arabia's importance, in the new era of US shale, will now be put to the test", said Bjørnar Tonhaugen, the head of oil markets at Rystad Energy.
The US was investigating if Iran was behind the Saudi strikes, Trump said, but "it's certainly looking that way at this moment".
"The damage has been contained", Prince Abdulaziz said, adding that 50 percent of the lost production has been restored.
The U.S. military, he said, is working with its partners to "address this unprecedented attack and defend the global rules-based order that is being undermined by Iran".
The attack on an Aramco refinery is expected to cut Saudi oil production in half for the near future.
Minister of Foreign Affairs Pompeo directly accused Iran this weekend, but did not provide any evidence.
For months, Iranian officials issued veiled threats, saying if Tehran is blocked from exporting oil, other countries will not be able to do so either.
British Foreign Secretary Dominic Raab said, "We will work with worldwide partners to forge the widest and most effective response", with a statement from his ministry saying the "UK remains committed to supporting the security of Saudi Arabia".