Sen. John McCain, R-Ariz., has threatened to subpoena 10 U.S. sailors if the Obama administration doesn't soon release more details about the sailors' January detention by Iran.
McCain, who has been highly critical of the nuclear deal with Iran, said he doesn't want to subpoena the sailors, but said he would if the administration doesn't release the findings of an investigation into the incident by March 1.
The Republican told reporters it's an option "I do not want to exercise" as he was returning to the U.S. from an international security conference in Germany. McCain chairs the Senate Armed Services Committee.
The Obama administration has said the release of the sailors after they were held just one day by the Islamic Revolutionary Guard Corps is an example of its effective diplomacy. Iran freed them after negotiations between Secretary of State John Kerry and Iranian Foreign Minister Javad Zarif, just days before the Iran nuclear deal was implemented and its international sanctions were lifted.