The U.S. Department of Justice and four state attorney generals filed an antitrust lawsuit against UnitedHealth Group on Tuesday in efforts to block the company's $3.3 billion proposed acquisition of rival home health and hospice provider Amedisys.

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.

The U.S. Department of Justice (DOJ) and four state attorneys general filed a lawsuit to block UnitedHealth Group’s (NYSE: UNH) acquisition of Amedisys