http://www.nbcnews.com/politics/white-house/white-house-denies-some-democrats-claims-former-ag-yates-testimony-n739511
".....Yates, former CIA Director John Brennan, and former Director of National Intelligence James Clapper — all former Obama-administration appointees — were set to appear for public hearings on Tuesday on Russian interference in the 2016 election.
However, Nunes abruptly cancelled that session, over the objections of Democrats. Instead, FBI Director James Comey and National Security Agency Director Adm. Michael Rogers were asked to return to the Hill to testify in a closed session on that date.
Ultimately, that meeting, too, was cancelled due to a scheduling conflict and will be rescheduled.
Nunes has also scrapped the rest of the committee's meetings this week....."