FREDERIC J. FROMMER

The Associated Press

WASHINGTON (AP) - The four major pro sports leagues and the NCAA are asking a federal judge for a preliminary injunction to prevent Delaware from implementing sports betting.

The motion was filed Tuesday in federal court in Delaware. Last week, the leagues filed a lawsuit against the state, arguing that the state's plan for sports betting violated federal law.

Congress banned sports betting in 1992 while allowing it in four states Delaware, Nevada, Montana and Oregon that had already been offering it.

The lawsuit argues that Delaware's plan to allow single-game betting would violate the legislation because Delaware has never offered single-game betting before.