Donald Trump has announced via Twitter that he will release the crude oil reserves of the USA in the event of supply bottlenecks. This was the president's reaction to the crisis triggered by the drone attacks on Saturday at the world's largest oil refinery, Abkaik, and the Khurai oil field in Saudi Arabia.
Currently there are around 61.2 billion barrels of oil reserves in the USA, as this chart with data from BP shows. The world's largest reserves are located in Venezuela, where in 2018 the figure was around 303.3 billion barrels.
Shortly after the drone attack, Houthi rebels in Yemen claimed responsibility for the attack. The USA, however, blames Iran, increasing the risk of an escalation in the clash between the two countries.