Trump supporters are using the Florida school shooting to call for an end to Russia probe

President Donald Trump's supporters are using the Florida school shooting to attack the FBI -- and call for an end to the Russia probe.

A Mississippi man notified the FBI in September of a disturbing comment posted on one of his YouTube videos from a social media user who shares the name of the accused gunman, but investigators said they had been unable to uncover details from the account.

"No other information was included in the comment, which would indicate a time, location, or true identity of the person who made the comment," said special agent Robert Lasky. "The FBI conducted database reviews, checks, but was unable to further identify the person who made the comment."

Some of the president's supporters have latched onto that report to blame the school shooting on the FBI investigation of Trump's campaign ties to Russia.