President Donald Trump said it was 'not acceptable' that the FBI missed signs the Florida school shooter was going to attack, slamming the agency for 'spending too much time' focusing on the Russian collusion investigation, informs dailymail.co.uk.

 After a week during which Robert Mueller appeared to prove Russian interference in the 2016 presidential election, Trump used the shooting, in which 17 died, including 14 children, to attack the FBI for going after him in the Russian collusion investigation.

And in just one 280 character tweet late Saturday night, he managed to conflate the two biggest national news stories of the week - Russian election interference and the Florida tragedy.

Trump sparked anger among many Twitter users - but perhaps none so much as Arizona State Congressman and Iraqi War veteran Ruben Gallego - who went so far as to call the president a psychopath. 

'You are such a psychopath that you have to make even the death of 17 children about you,' Gallego, a democrat, wrote. 'America will regret the day you were ever born.'  

The president failed to mention that the FBI, which has 35,000 employees, was alerted to the 19-year-old Nikolas Cruz at its field office in Miami. Field officers in Miami have nothing to do with looking into the Russian collusion into the 2016 election -  that is being handled in Washington.

The message came just a few hours after a late-afternoon tweet-storm from the president, in which he took aim at the 'fake news media' for failing to report that a Facebook executive confirmed the majority of Russian spending on ads came after the 2016 election. 

He also took the opportunity to attack Democrats for failing to pass gun control legislation during Obama's eight years in the White House. 

It seemed that in the series of Tweets about Russian collusion and the Florida school shooting, Trump was paving the way for his late-evening message linking the two things. 

These messages all came just one day after special counsel Robert Mueller issued a 37-page indictment, charging 13 Russian individuals and three companies with a series of crimes related to the Russian interference into the 2016 election.