Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Who gave Niebaum the wiretaps? Movie plot title: The Negotiator Movie plot: Lieutenant Danny Roman (Samuel L. Jackson), a top Chicago Police Department hostage negotiator, is approached by his partner Nate Roenick (Paul Guilfoyle) who warns him that according to an informant (whom he refuses to name), members of their own unit are embezzling large sums of money from the department's disability fund, for which Roman is a board member. When Roman goes to meet with him again he finds Roenick murdered seconds before other police arrive, pinning him as the prime suspect. Things only get worse for Roman when Internal Affairs investigator Terence Niebaum (J. T. Walsh), whom Roenick's informant suspected of involvement in the embezzlement, is assigned to investigate the murder. After the gun that killed Roenick is linked to a case Roman had worked on, Niebaum and other investigators search Roman's house and discover papers for an offshore bank account with a deposit equal to one of the amounts of money embezzled. Roman is made to surrender his gun and badge and his colleagues are doubtful of his protests of innocence. With murder and embezzlement charges pending, Roman storms into Niebaum's office and demands answers about who set him up. When Niebaum stonewalls, Roman takes Niebaum, his administrative assistant Maggie (Siobhan Fallon), police commander Grant Frost (Ron Rifkin), and two-bit con man Rudy Timmons (Paul Giamatti) as hostages. With the building evacuated and placed under siege by his own CPD unit and the FBI, Roman issues his conditions: finding Roenick's informant and summoning police Lt. Chris Sabian (Kevin Spacey), another top negotiator. Roman believes he can trust Sabian because he negotiates for as long as possible and see using force as a last resort, and being from another precinct eliminates him as a suspect in the disability fund scheme. Sabian clashes with the CPD but is given temporary command of the unit after they hastily attempt a breach that goes poorly, resulting in additional officers becoming Roman's hostages. Roman trades Frost to Sabian in exchange for...
Answer:
Roenick