Trump administration sought to block Sally Yates from testifying to Congress on Russia

...According to letters The Post reviewed, the Justice Department notified Yates earlier this month that the administration considers a great deal of her possible testimony to be barred from discussion in a congressional hearing because the topics are covered by the presidential communication privilege...
https://www.washingtonpost.com/world/national-security/trump-administration-sought-to-block-sally-yates-from-testifying-to-congress-on-russia/2017/03/28/82b73e18-13b4-11e7-9e4f-09aa75d3ec57_story.html