You should try to put yourself in his shoes. Like you wouldn’t hand over your phone when approached by three FBI agents when your family is at your side.
Perry is actually the ideal replacement for McCarthy as Speaker come January. He thinks and acts strategically. I am positive that he will deal with the FBI when the time comes and has the power to succeed.
Why would they need his phone, anyway? Isn't the NSA vacuuming up all of everyone's data to their petabyte (?) server farm? Doesn't the FBI have access to that/those database(s)?