"I know that Donald Trump says outrageous things all the time, but today he officially clinched the Republican nomination. So this is now as real as it gets," Clinton said as the billionaire emerged the Republican party's presidential candidate by securing the backing of 1,239 delegates, two more than is required to win the nomination.
"President (Barack) Obama came out of meetings with our closest allies in the world, and reporting that they are, quote, 'rattled by the threat Donald Trump represent'. Of course they're rattled. He's talking about breaking up our alliances, letting more countries get nuclear weapons, banning all Muslims from coming to America. That is a recipe for fewer friends and more enemies and it will make us less safe," Clinton said.
"The entire world looks to the president of the US for leadership and stability, and that is the kind of leadership I would provide if elected," Clinton said.
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"I just really regret that the kinds of things he is saying about letting other countries get nuclear weapons and bringing back torture, and just the outrageous comments that are literally being heard around the world," she told CNN.
"That's not who we are as Americans. That's not the kind of strong, smart, steady leadership that we need and deserve," Clinton said.
Speaking about a State Department Inspector General's report that she violated the laws by using private email hosted in her personal server when she was the Secretary of State, 68-year-old Clinton acknowledged her mistake.
"And if they do, I have faith in the American people that they'll make the right choice," she said.
Trump, 69, has slammed Clinton on the email report.
"Look, she has bad judgment. This was all bad judgment. Probably illegal. We'll have to find out what the FBI says about, but certainly it was bad judgment," he told reporters.