Defense lawyers for three ex-UBS AG municipal bond traders sought in cross-examination of a government witness to undermine prosecutors' claims that their clients broke the law.

Attorneys for Peter Ghavami, the former head of UBS's municipal derivatives group, and Gary Heinz and Michael Welty, former vice presidents and marketers in the group, today pressed an admitted bid-rigger cooperating with the government in the trial in federal court in New York.

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