WATCH: 'Make America Safe Again' theme of Cleveland RNC night 1

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The first night of the Republican National Convention kicked off Monday in Cleveland.

It was headlined by Donald Trump's wife Melania Trump, the wife of presumptive Republican nominee Donald Trump.  She rarely campaigns on behalf of her husband. But she's the Monday night headliner at the convention in Cleveland.

The theme of the evening was "Make America Safe Again" with national security front and center.

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Pat Smith told Republican delegates at their convention: "If Hillary Clinton can't give us the truth, why should we give her the presidency?"

Smith's son, Sean, was a State Department foreign service officer Sean Smith who died in the 2012 attack.

The convention's program Monday night had a strong focus on Benghazi - an issue that Republicans have pressed for years against Clinton, claiming her negligence contributed to the Americans' death.

Among the speakers, Marcus Luttrell, the retired Navy SEAL at the heart of the book and movie Lone Survivor, drew cheers and shouts of thank you from the crowd.

Luttrell was introduced by former Texas Gov. Rick Perry. Luttrell spoke about the need for the government to take better care of veterans when they return to the United States.

Luttrell praised Donald Trump's commitment to the military. Luttrell also somewhat touched on the recent violence against police officers - telling delegates that the nation's "next war is here."

And in a reference to the Black Lives Matter movement, Luttrell said: "In order for any life to matter, we all have to matter."

Television actor Scott Baio also spoke, telling the Republican National Convention that "our country is in a very bad spot" and that "we need Donald Trump to fix this."

Baio is the former star of "Charles in Charge" and "Happy Days. He said Monday at the convention in Cleveland that presumptive Republican nominee Trump isn't "a messiah." But Baio says Trump is someone he'd "trust with the lives of our family and the health of country."

The star of the TV show "Duck Dynasty" Willie Robertson also spoke. He said that America needs "a president who would have our back," and he says that's Donald Trump.

Robertson was the first speaker Monday night at the Republican National Convention in Cleveland. He tells the crowd of more than 2,000 delegates that that Trump is the candidate running for president who will best support the military and the nation's police officers.

Robertson tossed in a little playful criticism of the news media on Monday night, hitting them "for missing the Trump train." He joked that he and Trump had three things in common: they were successful businessmen, had hit television shows and had wives "more attractive than we are."