The committee early on sent letters to key witnesses such as Flynn, Page, former campaign manager Paul Manafort and longtime Trump adviser Roger Stone to preserve all documents that might be relevant to the investigation. One such letter was also sent to White House counsel McGahn, who previously served as chief counsel to the Trump campaign and has authority over its records.
But the committee has still not sent any follow up letters even asking for their documents much less issued a subpoena demanding they be turned over. Although letters requesting the material were drafted by Democratic staffers, Burr has so far declined to sign them, leaving the panels investigators powerless to review key material necessary to pursue the issues of possible collusion.
Moreover, the committee also hasnt even approached potentially key witnesses to schedule interviews with them. Manafort, Stone and Page have all publicly volunteered to be questioned by the committee staff. But so far, the committee seems stuck in a version of Catch-22: It has yet to follow up on those offers, in large part because it doesnt want to interview them until it has reviewed their documents and emails, which the committee hasnt asked for. (Flynn, through his lawyer, also has offered to talk but only until he first receives immunity a step the committee is in no rush to even consider.)