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Following the worst mass shooting in U.S. history, which left at least 50 people dead and dozens wounded at an Orlando nightclub, Donald Trump reacted to the horrific incident on social media.

Trump issued a statement on Facebook extending his sympathy for the victims and criticized the president and Hillary Clinton for not using the term "radical Islam."

He said that President Obama "should step down" for not using the term, and that Clinton "should get out of this race" if she still can't say it after this attack.

"We can't afford to be politically correct anymore," Trump wrote.

Earlier, Trump tweeted that he is praying for the victims and their families.

"When will this stop?" the presumptive Republican presidential nominee asked. "When will we get tough, smart and vigilant?"

In a later tweet, Trump also called out President Obama for refusing to utter the words "radical Islamic terrorism."

Hillary Clinton also took to Twitter this morning to react the shooting.

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