Maurice “Hank” Greenberg’s $25 billion lawsuit against the U.S. government over the bailout of American International Group Inc. moved a step closer to trial last week, as a federal judge denied the government’s motion for summary judgment.

That trial, set to begin Sept. 29, would feature testimony from former top government officials who led the response to the 2008 financial crisis, as well as some of Wall Street’s most prominent banking lawyers.