Israel is having talks with the United States about a new US defence aid package that is likely to take effect after the current agreement expires in 2017.
The two sides are on the verge of signing a new deal that would bring annual payouts to $3.6 billion, a US official told Reuters.
Current US military aid to Israel, negotiated in 2007, stands at $3 billion a year.
The United States provides Israel with additional military aid packages, including $500 million for Iron Dome missile defence system.
"They [the United States] are trying to douse the fires after our flare-up about the Iran deal," an Israeli official was quoted by Reuters as saying.
Israeli Prime Minister Benjamin Netanyahu confirmed the defence aid talks.
"There is no trade-off requiring I agree to this [nuclear] deal with Iran. The deal is bad and we will continue to oppose it," Netanyahu said.
On April 2, a framework accord was reached between world powers and Iran in Switzerland, setting a June 30 deadline for the final agreement.
Israel and several Gulf Arab countries have been vocal about their opposition to the nuclear negotiations, which they claim will bolster Iran’s power in the Middle East.
US President Barack Obama hosted on May 14 Gulf Arab leaders in Camp David offering them greater alliance.