America’s two biggest supermarket operators have gone from deal partners to legal rivals in less than 24 hours.Grocery-store operator Albertsons said it was terminating its planned sale to Kroger and filed a lawsuit alleging that Kroger didn’t do enough to secure regulatory approval for the companies’ $20 billion deal,

Albertsons on Wednesday formally terminated its proposed $25 billion merger with Kroger and filed a lawsuit against its supermarket competitor, saying Kroger violated its contract and didn’t follow through on commitments to help get the deal approved.

The supermarket chain had tried to join forces with Kroger, but judges sided with federal and state regulators who charged that the merger would reduce competition.