Trump: FBI missed Fla. shooter 'signals' spending 'too much time trying to prove Russian collusion'

President TrumpDonald John TrumpNFL freezes policy barring players from protesting during anthem McConnell spokesman on Putin visit: 'There is no invitation from Congress' Petition urges University of Virginia not to hire Marc Short MORE late Saturday suggested the FBI could have stopped the shooter who killed 17 people and injured 14 others at a Florida high school this week if the bureau spent less time working on the Russia investigation. 

"Very sad that the FBI missed all of the many signals sent out by the Florida school shooter. This is not acceptable. They are spending too much time trying to prove Russian collusion with the Trump campaign - there is no collusion. Get back to the basics and make us all proud!" Trump tweeted

His comment comes after the FBI said Friday that it had failed to follow "protocols" when it received a tip earlier this year about 19-year-old Nikolas Cruz, who officials say went on a rampage at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday. 

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In January, a person close to Cruz called the FBI's public tipline and raised concerns about a possible school shooting, citing his gun ownership and desire to kill.

But the FBI never reported the tip to its Miami field office or investigated the claim, the bureau said Friday.

Many lawmakers have called for an investigation of the FBI since it was first reported that they were tipped off about the alleged gunman being a possible threat. 

Trump's tweet also comes after the Friday indictments from special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's team charged that 13 Russian nationals and three Russian organizations attempted to sow discord in the 2016 U.S. presidential election. 

The indictment provided the same assessment reached by the U.S. intelligence community last year: that Russia interfered in the election in order to help Trump and hurt his Democratic rival, Hillary Clinton.