Sen. Tom Cotton Tom Bryant CottonBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Chris Wallace presses Cotton on 'any hypocrisy' between comments on Supreme Court vacancy in 2016 and today MORE (R-Ark.) on Sunday cast Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE as "reckless," citing emails on the Democratic presidential nominee's private email server that included references to the Iranian nuclear scientist who was executed there for treason.

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"I'm not going to comment on what he may or may not have done for the United States government, but in the emails that were on Hillary Clinton's private server, there were conversations among her senior advisers about this gentleman," Cotton said on CBS's "Face The Nation."

"That goes to show just how reckless and careless her decision was to put that kind of highly classified information on a private server and I think her judgment is not suited to keep this country safe."

Shahram Amiri, an Iranian scientist who reportedly gave information to the United States about Tehran's nuclear program, was executed in Iran. Amiri was hanged for treason after giving "vital information to the enemy," according to a spokesman for the Iranian judiciary.

Cotton said Sunday that national security will be the top issue of the presidential election.

Cotton was also asked whether GOP nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE had the temperament to handle making the kinds of decisions a president needs to make.

"I'm confident if the American people elect Donald Trump and they elect a Republican [Congress], that America will be safer and stronger in the world," he said. "Our streets will be safer and our country will be more prosperous."