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Donald Trump sparked outrage on social media after he tweeted “appreciate the congrats for being right about radical Islamic terrorism” in the wake of Sunday’s deadly shooting at a gay nightclub in Orlando, which at least 50 people dead and 53 injured.

The controversial GOP candidate was also critical of President Obama for not being tough enough against Islamic terrorists.

“Is President Obama going to finally mention the words radical Islamic terrorism? If he doesn’t he should immediately resign in disgrace!” he tweeted.

In a statement, Trump added that Hillary Clinton “should get out of the race” for presidency if she can’t say the worlds “Radical Islam.”

The gunman, identified as 29 year-old American citizen Omar Mateen, had reportedly called 911 to pledge his allegiance to the Islamic State terrorist group before the deadly attack, and ISIS is believed to have taken responsibility for the shooting. However, law enforcement sources told Reuters there is still no direct link between Mateen and the terrorist group.

Last year, Trump vowed to send Muslims “back to where you came from” following terrorism attacks in Paris and San Bernadino. He has also promised to “build a wall” to keep Meixcan immigrants from entering the U.S.

Stars and gay community activists criticized Trump’s self-referential tweets as being insensitive and inappropriate given the mass shooting in Orlando, one of the worst in U.S. history.

CNN’s Brian Stelter also points out that one of Trump’s was plagiarized from one of his previous campaign consultants, ex-Breitbart editor Sebastian Gorka.

Backlash following Sunday’s tweets:

 

Trump’s tweets about the incident: