WASHINGTON — Federal prosecutors and defense lawyers are tussling over the evidence that can be presented in the upcoming bid-rigging trial against former UBS Financial Services Inc. bankers Peter Ghavami, Gary Heinz and Michael Welty.

Late last week, attorneys for the three ex-bankers requested permission from the court to present evidence on municipal bond transactions other than 38 specific deals that prosecutors have said prove the allegations in the indictment.

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