Representative Matt Gaetz's ex-girlfriend granted immunity in sex trafficking probe

Prosecutors granted immunity to an ex-girlfriend of Representative Matt Gaetz before she testified last week in front of a federal grand jury hearing evidence in the investigation of the congressman, according to a source familiar with the matter.

Gaetz has been under investigation to determine if he violated sex trafficking laws and obstructed justice in that probe. Gaetz has previously denied all wrongdoing, and has said he has never paid for sex nor had sex with an underage girl.

The woman, who CBS News is not naming to protect her privacy, testified in front of a federal grand jury in Orlando last Wednesday. She is viewed as a potential key witness, according to two sources familiar with the investigation. One of the sources said she has information related to the investigation of both the sex trafficking and obstruction allegations.