Colorado grocery workers joined labor advocates and elected officials outside Denver city hall on Monday to rally against a proposed $24.6 billion merger between the nation’s two largest supermarket chains,

The third trial challenging the proposed Kroger, Albertsons merger began Monday in a Denver district court, but the case differs from separate lawsuits brought by the Federal Trade Commission and the Washington attorney general as it seeks $1 million each in civil penalties from the two grocers.

The event lined up with the start of a trial between the state of Colorado and grocery giants Kroger and Albertsons, which are pushing to merge.

The trial for the case brought forth by Colorado against the parent companies who run King Soopers and Safeway stores across the state will begin on Monday — marking the start of the third trial attempting to block the proposed $25 billion deal.

Kroger will face off with regulators over its embattled proposed merger with Albertsons – this time against Colorado Attorney General Phil Weiser.

The Colorado attorney general’s office will argue that the proposed merger between Kroger and Albertsons will hurt workers, shoppers and farmers.

Colorado Attorney General Phil Weiser held a virtual media briefing Thursday to provide an update on the lawsuit looking to block the potential merger between grocers Kroger and Albertsons. The challenge brought forth by Weiser follows two other lawsuits in Oregon and Washington State claiming a merger between the two would