The U.S.J.D. has filed a motion to keep InBev and Corona from becoming a single entity.
Why? Because if InBev gains control of Corona they will have 46% market share and the government is fearful that beer prices will be in the control of the macro-brewer. The only way InBev can stop this is to prove that the merger will not provide InBev the ability to go crazy with beer prices. Get more on this from The Washington Post