Fearing mass firings, or worse, retaliation by the people they helped prosecute, a group of agents scrambled to enlist a legal team who could stop the administration in court. Norm Eisen, a prominent ethics lawyer now leading dozens of lawsuits against the Trump administration, agreed within hours to represent the agents pro bono, along with Mark Zaid, a veteran whistleblower attorney. For more firepower, the two approached the giant Chicago-based law firm Winston & Strawn, which has a history of providing free representation to people and organizations that squared off against Trump’s first administration. But Winston declined to represent the FBI agents, three people with knowledge of the matter said. It was one of several cases Winston turned down in quick succession, they added, that would have pitted the firm against an openly retributive president.