The U.S. Justice Department and four states sued Tuesday to block UnitedHealth Group’s proposed $3.3 billion acquisition of Amedisys, a Louisiana-based home health company that would further United’s push into the home care and hospice markets.

Minnesota-based UnitedHealth Group Inc. is the focus of an antitrust lawsuit filed on Tuesday by the United States Department of Justice.

The U.S. Justice Department is moving to block UnitedHealth Group's $3.3 billion purchase of Amedisys Inc. over concerns the deal would harm competition in the market for home health services, Bloomberg News reported on Tuesday,