Kroger’s plans to buy its grocery rival Albertsons hit a major roadblock Tuesday, when a federal judge put a halt to the deal, which would be the largest supermarket merger in U.S. history.

A ruling could impact Kroger's mega-merger with rival supermarket chain Albertsons. A judge in Washington state Pans to issue a ruling in the antitrust case filed, over the $25 billion deal.The ...