The U.S. Department of Justice intercepted calls in 2015 between Gov. Sam Brownback’s office and former state senator Michael O’Donnell, the governor said Wednesday.

Letters from the federal agency disclosing the interceptions went to Brownback at his Cedar Crest residence, deputy chief of staff Kim Borchers, and Tim Shallenburger, a legislative liaison for the governor and president of the Kansas Development Finance Authority.

Senate President Susan Wagle, R-Wichita, also received a letter, her office said.

The governor’s office provided reporters with the letters it said it received Wednesday.

Multiple news organizations in Wichita received letters earlier this week saying the justice department had intercepted calls in 2015 between staff members and O’Donnell. The letters don’t indicate wrongdoing.

O’Donnell is currently a Sedgwick County commissioner. He was a Republican senator from Wichita at the time.

"We just got one today about phone calls with Michael O’Donnell. And I did talk with Michael O’Donnell on the phone, I talked with him a lot in person when he was here, he was a state senator, and I talked with him on the phone," Brownback said.

The one-page letters say the notice "does not mean that you are being charged in court with anything. This is simply a notice which the law requires we send you. It only means that you, or someone using a telephone subscribed to you, were intercepted talking with a person using the telephone number listed above."

The Wichita Eagle reported Tuesday that former staff members of the newspaper had received letters. Letters also were sent to multiple people in Wichita about the same time telling them their calls with Brandon Steven, a Wichita businessman, had been intercepted. It is unclear whether the federal probes of Steven and O’Donnell are related.

Those letters indicated O’Donnell’s calls were monitored in June and early July of 2015. Brownback said he doesn’t know the subject of the inquiry into O’Donnell.

The Eagle reported that Steven said he is the subject of an inquiry into poker and his efforts to open a casino. Steven and other Wichita investors tried unsuccessfully to win a state bid to build the Castle Rock Casino in southeast Kansas.

Steven said he has retained legal counsel and "we are fully cooperating with this matter."

The Associated Press contributed to this report.