Republican presidential candidate Donald Trump called on President Barack Obama to resign from office because he did not say the words "radical Islam"

Republican presidential candidate Donald Trump called on President Barack Obama to resign from office because he did not say the words "radical Islam," in a statement in response to the Orlando massacre where 50 people were killed.

"Because our leaders are weak, I said this was going to happen - and it is only going to get worse," Trump said in a statement. "I am trying to save lives and prevent the next terrorist attack. We can't afford to be politically correct anymore."

Trump's campaign said he will address the attacks in a speech he already had scheduled to deliver on Monday addressing national security and responding to criticism from Democratic rival Hillary Clinton.