Washington (CNN) Students who survived the Parkland, Florida, shooting laid into President Donald Trump after he linked the FBI's failure to follow up on a report about the school shooter and the resources expended on the Russia investigation.

On Saturday, Trump tweeted, "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!"

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! — Donald J. Trump (@realDonaldTrump) February 18, 2018

The President's tweet caused considerable outrage online, including among apparent survivors of the shooting:

"17 of my classmates are gone. That's 17 futures, 17 children, and 17 friends stolen. But you're right, it always has to be about you. How silly of me to forget. #neveragain"

"17 innocent people were brutally murdered at my school, a place where they should have felt safe. Their lives were gone in an instant. You are the President of the United States and you have the audacity to put this on Russia as an excuse. I guess I should expect that from you."

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