Sen. Tommy Tuberville (R., Ala.) is demanding answers from the Biden administration on what is being done in response to China’s sanctions on Trump administration officials, according to a Wednesday letter obtained exclusively by the Washington Free Beacon.

Ankara’s 2017 decision to purchase $2.5 billion worth of S-400 air defence systems from Moscow caused serious complications in its relationship with its US allies, with Washington booting Turkey out of the F-35 programme and sanctioning a key defence sector agency.

Iranian President Hassan Rouhani said Wednesday that his country would abide by the 2015 nuclear deal if the United States and the five other signatories abided by their responsibilities in the accord as well.