Miller is the aide credited with writing many of Trump’s most controversial speeches and helping to craft the parts of the presidential agenda most hostile to immigrants. He is one of Mueller’s few interviewees currently working in the Trump White House.
Sources tell CNN that “Miller’s role in the firing of FBI Director James Comey” was among the topics discussed. Miller helped Trump draft a memo describing the reasons Comey should be fired. Trump sent a separate letter to Comey himself, saying he was dismissing the head of the FBI for acting too quickly to close an investigation into Hillary Clinton’s private email server. The letter Miller helped Trump write was several pages long and included more reasons to dismiss Comey, including the fact that Comey would not say publicly that his investigation of Trump’s campaign was not focused on Trump himself, according to the Washington Post.
Miller would have been uniquely privy to Trump’s stated intentions during the drafting of the firing letter. Miller’s potential usefulness to the probe doesn’t end with the Comey firing letter: campaign worker George Papadopoulos told other Trump staffers at a March 2016 meeting that he could arrange a meeting between Trump and Russian president Vladimir Putin; Miller attended that meeting, a source told CNN.
Miller has been with Trump since January 2016, when he left his job as Jeff Sessions’ Senate communications director.