The Biden administration on Thursday rescinded former president Donald Trump’s restoration of U.N. sanctions on Iran, an announcement that could help Washington move toward rejoining the 2015 nuclear agreement aimed at reining in the Islamic Republic’s nuclear program.

Acting U.S. Ambassador Richard Mills sent a letter to the U.N. Security Council on behalf of President Joe Biden saying the United States “hereby withdraws” three letters from the Trump administration culminating in its Sept. 19 announcement that the United States had re-imposed U.N. sanctions on Tehran.

Mills said in the letter obtained by The Associated Press that sanctions measures terminated in the 2015 council resolution endorsing the nuclear deal with six major powers, but restored by Trump in September, “remain terminated.”