MILWAUKEE (AP) — Wisconsin Lt. Gov. Mandela Barnes, a Democrat running for U.S. Senate, logged more than 10 times as many hours of security than his predecessor, an issue that Republican Sen. Ron Johnson is raising in the hotly contested race.

The Milwaukee Journal Sentinel reported Tuesday that Barnes averaged more than 13 1/2 hours of security protection a day — including weekdays, weekends and holidays at a daily cost to the state of $660 for patrol officers’ wages.

Barnes’ increased use of security was an issue early in his term as lieutenant governor, and now Johnson is raising it again in the context of his reelection campaign.

Maddy McDaniel, a Barnes spokesperson, said the State Patrol’s Dignitary Protection Unit decides whether to provide the lieutenant governor with security for any particular event or day and how many patrol members to use.