Abbas Mousavi made the statement on Sunday.
Saturday's attacks knocked out more than half of Saudi oil output, or more than 5% of global supply.
That drew an angry response from Tehran, where a foreign ministry spokesman said: "Such fruitless and blind accusations and remarks are incomprehensible and meaningless".
Iran dismissed accusations by the United States that it was behind attacks on Saudi oil plants that risk disrupting global energy supplies and warned on Sunday that US bases and aircraft carriers in the region were in range of its missiles.
Mousavi said the USA allegations over the pre-dawn strikes on Abqaiq and Khurais in Eastern Province were meant to justify actions against Iran.
The remarks were created to damage Iran's reputation and provide a pretext for "future actions" against the Islamic republic, he added.
Tehran and Washington have been at loggerheads since May a year ago, when Trump pulled the U.S. out of a landmark 2015 deal that promised Iran relief from sanctions in return for curbs on its nuclear programme.
In remarks published Sunday, the commander of the Islamic Revolutionary Guard Corps' aerospace arm said Iran's missiles could hit United States bases and ships within a range of 2,000 kilometres (about 1,240 miles).
DAMASCUS - At least 11 people were killed Sunday when an explosive-laden truck went off in a rebel-held town in the countryside of Aleppo province in northern Syria, a war monitor and state news agency SANA reported.