Trump associates 'deleted communications'published at 19:13 British Summer Time 18 April 2019
The special counsel's report revealed that some of the individuals interviewed by the Mueller team, including some associated with the Trump campaign, "deleted relevant communications or communicated during the relevant period using applications that feature encryption"
"The investigation did not always yield admissible information or testimony, or a complete picture of the activities undertaken by subjects of the investigation," the report reads on page 10.
And Mueller notes in the report that "the office cannot rule out the possibility that the unavailable information would shed additional light on (or cast in a new light) the events described in the report".