The FBI is now in the process of reviewing that information, which includes human intelligence, travel, business and phone records and accounts of in-person meetings, according to those U.S. officials.
One law enforcement official said the information in hand suggests...
"people connected to the campaign were in contact and it appeared they were giving the thumbs up to release information when it was ready."
Though FBI counterintelligence investigators cautioned that the information was not conclusive they have intimated that it has heightened their suspicions.
Adding credence to these allegations is FBI director Comey's statement at Mondays House intel hearing in which he said the organization had began looking into possible coordination between Trump campaign associates and suspected Russian operatives because the bureau had gathered...
"a credible allegation of wrongdoing or reasonable basis to believe an American may be acting as an agent of a foreign power."
An official said the FBI cannot yet prove that collusion took place, but the information suggesting collusion is now a large focus of the investigation.
It is known that the FBI have been investigating four former Trump campaign associates who include Michael Flynn, Paul Manafort, Roger Stone and Carter Page for contacts with Russians known to US intelligence.
The White House has not commented on these allegations yet.