Editor's note: This story has been updated with a statement from Kroger.

The Federal Trade Commission (FTC) has reached the halfway point in a trial where it is trying to convince an Oregon federal judge to grant an injunction that would prevent two of the largest grocers —The Kroger Co.(NYSE:KR) andAlberstons Companies, Inc.(NYSE:ACI) — from carrying out a $25 billion merger.

What Happened: According to the Wall Street Journal, the FTC retained expert witnesses to testify that groceries could get more expensive if Kroger and Albertsons combined.

Last week, the FTC attacked both companies' proposal to...