Iran will take a third step to reduce its commitments to a landmark 2015 nuclear deal within the framework of the pact, Iranian Foreign Minister Mohammad Javad Zarif said on Saturday, according to parliamentary news agency ICANA. 

"The third step in reducing commitments to (the nuclear deal) will be implemented in the current situation," he said. 

"We have said that if (the deal) is not completely implemented by others then we will also implement it in the same incomplete manner. And, of course, all of our actions have been within the framework of (the deal)."

Iranian President Hassan Rouhani accused the U.S. of "childish behavior" on Thursday over Washington's sanctioning of Iran's foreign minister.

"They (Americans) are resorting to childish behavior... They were claiming every day 'We want to talk, with no preconditions'... and then they sanction the foreign minister," Rouhani said in remarks carried live on state television. "This means they have lost the power of rational thought."

The sanctions against Zarif would block any property or interests he has in the United States, but the Iranian foreign minister said he had none. 

Trump pulled the United States out of the deal last year and ramped up sanctions to put pressure on Iran's economy.