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Republican U.S. presidential candidate Donald Trump gestures during a campaign rally in Tampa, Florida, June 11, 2016. Scott Audette/Reuters

UPDATE: 3:15 p.m. EDT — Likely Republican presidential nominee Donald Trump again proposed restricting immigration into the United States Monday during a major speech in Manchester, New Hampshire. Trump, who previously said Muslims shouldn't be allowed to enter the country "until we figure out what the hell is going on," argued in favor of banning people from countries that have a proven history of terrorism against the U.S., Europe or its allies.

"I refuse to allow America to become a place where gay people, Christian people, Jewish people are targets of persecution and intimidation by radical Islamic preachers of hate and violence," Trump said Monday. "This is not just a national security issue. It's a quality of life issue."

Trump spent most of his 30-minute speech responding to a Sunday shooting at a gay nightclub in Orlando, Florida, that left about 50 people dead and another 50 injured. During the shooting, suspect Omar Mateen declared his allegiance to the Islamic State group. Mateen was born to Afghan parents in Queens, New York.

"We cannot continue to allow thousands upon thousands of people to pour into our country — many of whom have the same thought process as this savage killer," Trump said.

He lambasted Democratic rival Hillary Clinton for her loose immigration policies and political correctness and criticized American Muslim communities for not alerting authorities to Mateen's radical behavior. Trump also vowed that, if president, he'd put together a competent administration that would improve the screening process for immigrants.

In another part of his speech, he touched on the civil rights aspect of the Orlando shooting. "It's an assault on the ability of free people to live their lives, love who they want and express their identity," Trump said. "Hillary Clinton can never claim to be a friend of the gay community as long as she continues to support immigration policies that bring Islamic extremists to our country and who suppress women, gays and anyone who doesn't share our values."

Original story:

Presumptive Republican presidential nominee Donald Trump has responded to news of Sunday's mass shooting in Orlando, Florida, in tweets, a statement and various interviews with TV news stations. But Monday, he's expected to speak about the tragedy at length in a speech at St. Anslem College in Manchester, New Hampshire.

Trump's campaign has called the private event a "major speech," according to the Union Leader. It's set for 2:30 p.m. EDT. Check CNN for a live stream here or see video from the event on YouTube below:

Trump will talk about being smart and vigilant, mentioning "the difficult subjects in order to produce common sense solutions for all Americans," campaign manager Corey Lewandowski told NBC News. Trump will also touch on his plans for dealing with terrorism, "because there should be no other option when it comes to the threats we face to our safety and freedoms," Lewandowski added.

Early Sunday morning, a 29-year-old named Omar Mateen opened fire outside of a gay nightclub in Orlando. After fighting with police, Mateen entered, took hostages and eventually killed 49 people. Mateen, who had been previously interviewed by the FBI, called 911 during the attack to declare his loyalty to the Islamic State group, ABC News reported. Mateen died in a gunfight with police.

President Barack Obama called the massacre "an act of terror and hate." It is the deadliest mass shooting in American history.

Trump seized on Mateen's heritage in a statement released Sunday, labeling the suspect a radical Islamic terrorist and calling out his Afghani parents. He also criticized Obama for not referring to Mateen as such.

"If we do not get tough and smart real fast, we are not going to have a country anymore. Because our leaders are weak, I said this was going to happen — and it is only going to get worse," Trump said. "I am trying to save lives and prevent the next terrorist attack. We can't afford to be politically correct anymore."

Trump had originally been scheduled to appear at a Monday rally in Portsmouth, New Hampshire, and launch a major offensive against presumptive Democratic nominee Hillary Clinton. Before the shooting changed his plans, Trump promised to discuss "all of the things that have taken place with the Clintons." International Business Times has reported extensively on donors to Clinton's campaign and the Clinton Foundation.