A former federal prosecutor from Brooklyn who spent his career going after mobsters, ponzi-schemers, and white collar criminals, Weissmann is known as a tenacious operator who uses strategies that have dazzled some legal experts and disturbed others. They believe his presence on Mueller’s team means the probe may push legal boundaries as it investigates alleged collusion between Trump and Russian interests…

But perhaps Weissman’s best attribute for Mueller is that he’s accustomed to cases that involve extraordinarily complicated legal and geopolitical questions – the kind of questions the special prosecutor team will surely face as it looks to unravel allegations that Trump campaign officials and allies worked with Russian government operates in the lead-up to the presidential election.