House Speaker Paul Ryan on Friday criticized President Obama’s decision to purchase $8.6 million worth of heavy water from Iran, and said the U.S. should not be in a position of economically subsidizing Iran.

“For Tehran, the nuclear agreement is the gift that keeps on giving,” Ryan said. “This purchase — part of what appears to be the administration’s full-court press to sweeten the deal — will directly subsidize Iran’s nuclear program. It’s yet another unprecedented concession to the world’s leading state sponsor of terrorism.”