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This is an exclusive reporting from Fox News:

A mid-August 2016 counterintelligence briefing for the Trump campaign did not specifically warn officials about Russian outreach to the Trump team, nor did it warn that two campaign aides, Mike Flynn and George Papadopoulos, were already under FBI investigation, Fox News has learned.

The new details about the so-called “defensive briefing” have emerged from congressional letters, text messages between FBI agent Peter Strzok and lawyer Lisa Page, and sources familiar with the matter. Such briefings are designed to warn the candidate and his team about national security threats.

“There was a defensive briefing of candidate Trump on Aug. 17 of 2016,” Texas Rep. John Ratcliffe, a member of the House Judiciary Committee, said Thursday on Fox News’ “America’s Newsroom.” “And I can tell you what he wasn’t told: He wasn’t warned about a Russia investigation that Peter Strzok had opened 18 days earlier.”

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