Trump wrote on Twitter about the alleged Florida high school shooter accused of killing 17 people at Marjory Stoneman Douglas High School.

“So many signs that the Florida shooter was mentally disturbed, even expelled from school for bad and erratic behavior,” he tweeted. “Neighbors and classmates knew he was a big problem. Must always report such instances to authorities, again and again!”

So many signs that the Florida shooter was mentally disturbed, even expelled from school for bad and erratic behavior. Neighbors and classmates knew he was a big problem. Must always report such instances to authorities, again and again!

— Donald J. Trump (@realDonaldTrump) February 15, 2018

He received backlash from users who questioned why the president was possibly finding fault with neighbors and classmates and did not mention stricter gun laws.

rump has not yet spoken publicly about the shooting, which is among the 10 deadliest mass shootings in modern U.S. history and the deadliest school shooting since the 2012 Sandy Hook massacre in Connecticut.