Tensions flare with Italy's ruling coalition over corruption

Italys deputy transport minister has been placed under investigation in a corruption probe, becoming the latest political pawn in Italys uneasy ruling coalition between the right-wing, anti-migrant League party and the populist 5-Star Movement.

League member Armando Siri categorically denied wrongdoing and asked Thursday to immediately respond to prosecutors questions.

That didnt stop his boss, 5-Star member Danilo Toninelli, from revoking Siris authority pending further clarity in the investigation. Five-Star leader and deputy premier Luigi Di Maio called for Siri to resign.

The League stood by Siri, saying it had full confidence in him. It called for a quick investigation that leaves no shadows about his behavior.

The onetime rival parties formed a coalition government last year. The League has seen its popularity soar ahead of the European Parliament elections next month.