Trump thanks supporters for praise about 'being right' after Orlando shooting
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Presumptive GOP presidential nominee Donald TrumpDonald John TrumpTrump calls for Republicans to be 'united' on abortion Tlaib calls on Amash to join impeachment resolution Facebook temporarily suspended conservative commentator Candace Owens MORE on Sunday thanked his supporters for their praise after an attack at an Orlando, Fla., nightclub that left 50 people dead and many more injured.

"Appreciate the congrats for being right on radical Islamic terrorism, I don't want congrats, I want toughness & vigilance," Trump tweeted Sunday.

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"We must be smart!"

The tweet sparked a backlash over its content and timing.

The attack at the Orlando nightclub early Sunday morning is considered the worst mass shooting incident in U.S. history.

It took place at a gay club during Pride Month.

Police said the shooter, who was killed inside the nightclub during a shootout with police, had an assault-style rifle, a handgun and "some type of device."

An agent from the FBI's Orlando field office said there are "suggestions" the suspect may have had "leanings" toward radical Islamic ideology. But it was not immediately clear if the incident was inspired by foreign terrorism.

Rep. Adam SchiffAdam Bennett Schiff5 things to watch as Trump, Dems clash over investigations Mueller mystery: Will he ever testify to Congress? Overnight Defense: Congressional leaders receive classified briefing on Iran | Trump on war: 'I hope not' | Key Republican calls threats credible | Warren plan targets corporate influence at Pentagon MORE (D-Calif.) said he was told the shooting suspect had pledged allegiance to the Islamic State in Iraq and Syria. 

Trump tweeted about the attack earlier in the day, calling it a "horrific incident" and calling for the country to get "tough, smart & vigilant."

As of Sunday, Trump had not changed his schedule for the upcoming week. He is scheduled to give a hard-hitting speech Monday on the Clintons.

— This report was updated at 1:30 p.m.