Donald Trump Jr. delivered a blistering indictment of Hillary Clinton and emerged as a high-profile supporter of school choice and gun rights on Tuesday night as he praised his father just hours after the elder Trump claimed the Republican presidential nomination.

'If Hillary Clinton were elected, she would be the first president who couldn't pass a basic background check. It's incredible!' he told a packed convention floor in Cleveland's Quicken Loans Arena.

'Hillary Clinton is a risk Americans can't afford to take.'

Trump, 38, soaked up applause from thousands – and then tweeted: 'Now that was intense. What a rush.'

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'Hillary Clinton is a risk Americans can't afford to take,' Donald Trump Jr. told the Republican National Convention on Tuesday night

Trump, 38, soaked up applause from thousands – and then tweeted: 'Now that was intense. What a rush'

The younger Don and his sister Ivanka watched hours earlier as the New York delegation's votes put their father over the top and made him the official GOP nominee

He framed the Democratic Party as obstructionist and government-obsessed – and did it without naming them.

'The other party gave us a regulatory state on steroids,' he boomed. 'The other party is the party of risk.'

'The other party gave us public schools that all too often fail our students, especially those who have no options.'.

'Our schools used to be an elevator to the middle class,' Trump said. 'Now they're stalled on the ground floor. They're like Soviet-era department stores that are run for the benefit of the clerks and not the customers, for the teachers and the administrators and not the students.'

'You know why other countries do better in K through 12? They let parents choose where to send their own children to school!' he exclaimed. 'That's called competition. It's called the free market. And it's what the other party fears.'

'They fear it because they're more concerned about protecting the jobs of tenured teachers than serving the students in desperate need of a good education.'

School choice advocates push for voucher programs that permit parents to send their children to private schools for which they qualify, and to do it with taxpayer dollars.

The Republican nominee's oldest son soaked up applause from thousands on the convention floor and then tweeted: 'What a rush'

They see such programs as a path toward shuttering failing schools as families flee, and a leveling influence that allows poor parents to give their children opportunities usually reserved for the wealthy.

'We're going to make our schools the best in the world for every single American of every single ethnicity and background,' he pledged.

Trump cast Clinton, as his father has, as an anti-Second Amendment activist who would upend gun rights and erect roadblocks in front of the law-abiding who want firearms for self-defense.

'She says she'll issue executive orders to take away Americans' guns,' he claimed. 'She wants to appoint judges who will abolish the Second Amendment.'

'Just look at how effective those laws have been in inner-city Chicago, a city with the toughest gun laws in our nation, where 70 people were murdered last month alone.'

Trump also made a pitch for fossil fuels, blasting Clinton for her vow to put coal mines out of business.

'When people tell him it can't be done, that guarantees it gets done,' Trump Jr said of his father

Trump tweeted this message today to show how proud he was of his children's performances in Cleveland

If she were elected president, he predicted, 'she'll throw every possible obstacle in the path of safe, reliable, affordable energy produced in America, by Americans, for American businesses and families.'

'Rather than being energy independent, our country will be forced to be beholden to her buddies in the Middle East.'

And he declared the terror attacks that killed four Americans in Benghazi, Libya four years ago 'would be repeated, were she to win the election.'

'Those are risks we can't afford to take,' he added. 'And when we win, we're not gonna have to.'

He described his father as a tough-but-fair businessman 'who has a track record of accomplishing the impossible'

Trump cast Clinton, as his father has, as an anti-Second Amendment activist who would upend gun rights and erect roadblocks in front of the law-abiding who want firearms for self-defense

Trump described his father as a tough-but-fair businessman 'who has a track record of accomplishing the impossible.'

'When people tell him it can't be done, that guarantees it gets done.'

The newly minted GOP nominee, he said, would be 'a president who knows we can't simply delete our problems, but that we have to tackle them head-on.'

'We've lost confidence in our leaders and faith in our institutions,' he said, in a dig at the Obama administration and its first secretary of state.

'But remember: We're still Americans, we're still one country, and we're gonna get it back.'