In a speech to an American Legion convention in Cincinnati, Ohio, Hillary Clinton on Wednesday again questioned Donald Trump's temperament as a reason to oppose his bid for President, as Clinton argued Trump would undermine American foreign policy alliances and the overall security of the U.S.

"American leadership means bringing the world together," Clinton said in her speech, as she denounced Trump for threatening to walk away from NATO, labeling that 'wrong' and 'dangerous.'

"American leadership means standing with our allies," Clinton said, "Because our network of allies is part of what makes us exceptional."

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Credit: Jamie Dupree

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Credit: Jamie Dupree

Clinton also jabbed at Trump over his campaign slogan.

"My opponent is wrong when he says America is no longer great," as she argued that the U.S. is an exceptional nation.

While Clinton did not specifically mention Trump's visit to Mexico today, one passage was clearly aimed at that, as she again raised questions about Trump's ability to deal with neighbors and allies.

"It certainly takes more than trying to make up for a year of insults and insinuations, by dropping in on our neighbors for a few hours and then flying home again - that is not how it works," Clinton added.