![WH blocks ex-McGahn aide from answering more than 200 questions](https://static.politico.com/dims4/default/8aaa44a/2147483647/resize/1160x/quality/90/?url=https%3A%2F%2Fstatic.politico.com%2Fe6%2F8b%2F4e12846b43c0b0d53e3053e031c4%2F190708-don-mcgahn-ap-773.jpg)
The White House has blocked a third witness who provided crucial testimony to special counsel Robert Mueller from describing the chaos she witnessed in the West Wing as President Donald Trump sought to assert control over the investigation of Russian interference in the 2016 election.
“The White House has directed that I not respond to this question because of the constitutionally-based executive branch confidentiality interests that are implicated,” former top White House aide Annie Donaldson repeated more than 200 times in written responses to the House Judiciary Committee, according to a transcript released Monday.