The Trump campaign has been attacking Clinton over the uranium deal lately, perhaps as a way to distract attention from criticism of Trump’s interest in fostering a closer relationship with Russia.
In 2010, the Committee on Foreign Investment in the United States (CFIUS) and the U.S. Nuclear Regulatory Commission (NRC) approved the deal allowing Russia to increase their share of Uranium One. In 2013, Russia assumed 100 percent ownership, giving Russia control of about 20 percent of U.S. uranium extraction capacity. However, Uranium One does not have an NRC export license, so no uranium produced may be exported. CFIUS comprises nine different agencies, one of which is the State Department.
There is no evidence Clinton herself got involved in the deal personally, and it is highly questionable that this deal even rose to the level of the secretary of state. Theoretically, Clinton could have intervened. But even then, it ultimately would have been Obama’s decision whether to suspend or block the deal.
The Washington Post gave four Pinocchio's to Trump's claim that Hillary Clinton gave the Russians 20 percent of the U.S. uranium.