The max was 6k bpd in 2021 of petroleum and petroleum liquids, the equivalent of 2.2 million barrels, slightly more than one VLCC can carry.
What's next, imports from Russia?
Treasury Department authorizes Iranian oil sales through August
... The authorization allows the import of Iranian oil and refined products into the U.S.
... The authorization allows the import of Iranian oil and refined products into the U.S. Payment can be made to Tehran in dollars. The license expires Aug. 21, unless it’s renewed. ...
Oil prices fall after U.S. authorizes Iranian crude sales
Trump actually started the ball rolling during the pandemic in 2020.
He bought some petroleum products from Iran in October 2020 after the collapse in oil demand crashed prices of WTI to -$37/barrel in April.
Biden made purchases in March 2021, January 2022, and in 2023 from August to October.
