I recall a meeting of Mueller at TT. I recall a photo of him in an overcoat, with a briefcase in the TT lobby. I cannot find evidence on the internet, however. Scrubbed? Faulty memory?
I believe Mueller went to TT to be interviewed for Attorney General in December 2016.
Sharyl Attkisson's Timeline does not mention a TT meeting with Mueller. The first mention of Mueller after Trump is elected is:
May 16, 2017: ... Trump reportedly interviews, but passes over, former FBI Director Robert Mueller for position of FBI Director
followed the next day with:
May 17, 2017: Deputy Attorney General Rod Rosenstein appoints Robert Mueller as Special Counsel, Russia-Trump probe
The timing of the last two entries certainly raises one's eyebrows...