The White House did not immediately respond to a request for what the time the letter was sent.
The crux of the evidence of collusion was, before the hearing, a senior White House official told a New Yorker reporter to pay special attention to the issue of incidental intelligence collection and to watch how Nunes presses the issue to show how "it's not just incidental, it's systematic".
Nunes' first press conference on the intelligence came two days after FBI Director James Comey testified to the House Intelligence Committee that the bureau was looking into potential collusion between the Trump campaign and Russian officials to affect the election.
"First, I recently confirmed that on numerous occasions, the intelligence community incidentally collected information about US citizens involved in the Trump transition", he announces.
That its objective was to block the public hearing and thereby reduce the combined pressure of the media and the Democratic Party on the White House was demonstrated by the fact that Nunes gave no date for the closed-door hearing for Comey and Rogers, which he now claimed was a higher priority. The officials said that this month, shortly after Mr. Trump wrote on Twitter about being wiretapped on the orders of President Barack Obama, Mr. Cohen-Watnick began reviewing highly classified reports detailing the intercepted communications of foreign officials.
White House press secretary Sean Spicer last week cast doubt on the idea that the intelligence came from the White House, saying it "doesn't pass the smell test".
Diego Costa open to moving to Ligue 1
For France, defender Adil Rami dropped out of the squad on Sunday with a calf injury and was replaced by Athletic Bilbao's Aymeric Laporte.
We can perhaps expect Nunes to quibble with the definition of a "White House staffer" or what constitutes "any of [Trump's] aides".
Nunes has so far refused to reveal his source of the material and has resisted calls to step down as head of the House Intelligence investigation.
There, he meets with an unnamed source who gives him info that says, during the election, Trump and his aides were caught up in surveillance by the intelligence community.
WASHINGTON (AP) - The White House refused to say on Thursday whether it secretly fed intelligence reports to a top Republican investigating possible coordination between Russian Federation and the 2016 Trump campaign.
He added that his "smell test" remark was based on Nunes's words at the time.
Rep. Adam Schiff (D-CA), the ranking member of the House Intelligence Committee, said on Thursday that the White House's announcement of materials relevant to his panel's investigation raises "profound questions" about how and why that information was made available, and to whom. He has declined to name them, but he and a spokesman have reportedly said and/or strongly suggested it wasn't White House staff.