Secretary of State Antony Blinken said Sunday the $6 billion in Iranian funds expected to be unfrozen in the U.S. prisoner swap with Iran have remained unspent, pushing back against suggestions that the Biden administration’s deal may have contributed to Hamas’s recent attacks on Israel.

“The facts are these — no U.S. taxpayer dollars were involved,” Blinken said on CNN’s “State of the Union.” “These were Iranian resources that Iran had accumulated from the sale of its oil that were stuck in a bank in South Korea. They have had from day one, under our law, under our sanctions, the right to use these monies for humanitarian purposes.”

“From one account to another in another country to facilitate that use,” Blinken continued. “As of now, not a single dollar has been spent from that account.”

Blinken’s comments follow Palestinian militant group Hamas’s onslaught of attacks against Israel on Saturday that left hundreds of people dead and thousands of others wounded.