Weissmann had initially committed to seeing the investigation led by Mueller to its conclusion. However, he became increasingly disillusioned with the direction it was taking. Weissmann was particularly frustrated by the limited focus that Mueller applied to the investigation, which he felt did not encompass the full scope of issues at hand.

This disappointment led to Weissmann's desire to distance himself from the investigation. He expressed to his friends that he could no longer remain involved in a process that he believed fell short of its potential, highlighting a significant rift in their approach to the inquiry surrounding Trump.