The FBI would release a transcript of the conversations between the Orlando gunman and the police.
In the years since people reported disturbing run-ins with Omar Mateen.
"He was always like a loner," Heather LaSalla said.
Omar Mateen searched for the terms "Pulse Orlando" and "Shooting," according to a letter released by a Senate committee.
Omar Mateen never lost his license to carry a gun even though he said to co-workers that he had ties with al-Qaeda and was a member of Hezbollah.
"It appears she had some knowledge of what was going on," said U.S. Senator Angus King.
Patrons of the Pulse came forward to say that they had seen the 29-year-old American-born Muslim there a number of times or that he had been using gay dating apps.
But nothing seemed to point out at him becoming a mass murderer.
The suspect in the Orlando attack was identified as Omar Mateen of Port St. Lucie, Florida.
President Barack Obama decried the deadliest mass shooting in American history on Sunday as an "act of terror" and an "act of hate" targeting a place of "solidarity and empowerment" for gays and lesbians.