A spokesman for U.S. Senate challenger Milton Wolf has acknowledged he initially failed to pay Kansas income taxes in 2000, resulting in a state warrant before the bill was paid off.

Roberts’ campaign raised the issue in a campaign mailer this week, just days before Tuesday’s primary.

Wolf campaign spokesman Ben Hartman on Friday said Wolf failed to pay $2,135 in taxes because he was working for his uncle’s medical products company in Texas, and it didn’t withhold taxes after Wolf moved to Kansas.

A warrant to pay the bill was issued in 2002, and Hartman said Wolf and his wife took extra jobs to pay it off in 2003.

Hartman says attention to the case shows Roberts is desperate.

Roberts spokesman Leroy Towns said voters should know.