03/21/2010 05:12 am ET Updated May 25, 2011

FBI Investigates John Ensign Affair

Federal agents have started interviewing people connected to Sen. John Ensign's (R-Nev.) sex scandal, a potential sign that the Nevada Republican could face a criminal probe over the matter, according to several sources familiar with the matter.

The FBI has contacted former aides to Ensign - in both Las Vegas and in Washington, the sources said. The sources said it appears that the FBI has begun a preliminary review of the case, and there's no evidence yet that it will become a full-fledged criminal investigation into the senator's conduct. At the same time, the Senate Ethics Committee has already launched an inquiry, issuing subpoenas last month to a slew of former Ensign aides.

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