Republican presidential candidate Donald Trump and Democratic rival Hillary Clinton unleashed some of their harshest criticisms about each other to date, a day after a televised forum on national security put each under a strong spotlight.

Appearing at a school in Cleveland, Ohio, Trump said Clinton's performance Wednesday night was more evidence she is unfit to be commander-in-chief. Trump said Clinton continues to refuse to take responsibility for her "failed" Middle East policies as secretary of state.

He called Clinton "trigger happy" in a race to invade countries and topple regimes, resulting in "ruin and death" in Libya, Iraq, and Syria.

When she was secretary, Clinton ran a criminal enterprise, Trump asserted, by granting favors to donors to the Clinton Foundation charity, and accused her of smashing telephones with hammers to hide evidence from investigators.

Trump intimated that those who back Clinton for president are "suckers."

Clinton told a rally in Charlotte, North Carolina that Trump's comment that Russian President Vladimir Putin is "far more" of a leader than President Barack Obama "shocked her."

"That is not just unpatriotic, it's not just insulting to the office and to the man who holds the office. It is scary, it is dangerous," she said.

Clinton also derided Trump's so-called "secret plan" to defeat Islamic State. She says it is a secret because he has no plan. She also took Trump to task for commenting in public Wednesday night on a confidential national security briefing given to presidential candidates.

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