HARRISBURG (AP) - The FBI tapped the phone of a top Pennsylvania Treasury Department official in 2014, months before his boss was hit with federal extortion charges.

The Tribune-Review of Pittsburgh reported Thursday (http://bit.ly/1htejcT ) that the U.S. District Court in Harrisburg sent a Sept. 14 letter to at least one person advising them that their call with John Lisko had been intercepted.

The letter says Judge Christopher Conner authorized the wiretap for a month, starting April 29, 2014.

Lisko tells the newspaper that federal investigators approached him and he cooperated. Lisko hasn't been implicated. Lisko was chief of staff to then-Treasurer Rob McCord before leaving to help McCord's failed campaign for governor. He's now the department's chief investment officer.

McCord resigned Jan. 30 and pleaded guilty to federal extortion charges days later. He's awaiting sentencing.

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Information from: Pittsburgh Tribune-Review,

http://pghtrib.com