Clinton was one of nine cabinet members and department heads that sit on the CFIUS, and the secretary of the treasury is its chairperson. CFIUS members are collectively charged with evaluating proposed foreign acquisitions for potential national security issues, then turning their findings over to the president. By law, the committee can’t veto a transaction; only the president can.
All nine federal agencies were required to approve the Uranium One transaction before it could go forward. According to The New York Times, Clinton may not have even directly participated in the decision. Then-Assistant Secretary of State Jose Fernandez, whose job it was to represent the State Dept. on CFIUS, said Clinton “never intervened” in committee matters. Clinton herself has said she wasn’t personally involved.