The man was stopped in a police check in mid-February.
He then had 0.56 milligrams of alcohol per liter in his breath, which is over the limit for serious drunken driving.
The man also lacked a driver's license.
The politician has admitted in police interrogation that he drank a strong beer earlier in the day and that he had drunk a liter of wine the day before.
The police seized the man's car after he was stopped.