Eshaq Jahangiri said that Iran would "sell as much oil as [it] can" despite US efforts to reduce Iran's oil exports, as quoted by the Fars News Agency.
Earlier, Iranian President Hassan Rouhani warned US President Donald Trump of the consequences of applying new sanctions against Tehran.
The Iranian president added that the country would stand firm against Washington's pressure.
In late June, OPEC members and other major oil producers that participated in the 2016 Vienna deal, including Russia, agreed to increase oil production to one million barrels per day. The deal, which came into effect in 2017, has been extended twice since then and will remain in force until the end of 2018.