Sen. Tom CottonThomas (Tom) Bryant CottonHillicon Valley: Lawmakers say Facebook deepfake ban falls short | House passes bills to win 5G race | Feds sound alarm on cyberthreat from Iran | Ivanka Trump appearance at tech show sparks backlash Cotton introduces bill blocking intel sharing with countries relying on Huawei for 5G GOP senators introduce resolution to change rules, dismiss impeachment without articles MORE (R-Ark.) on Sunday cast Hillary ClintonHillary Diane Rodham ClintonFormer Vermont Governor: Sanders 'will play dirty' NYT: Justice investigating alleged Comey leak of years-old classified info New Hampshire state lawmaker switches support from Warren to Klobuchar 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 TrumpDonald John TrumpLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Saudi Arabia paid 0 million for cost of US troops in area Parnas claims ex-Trump attorney visited him in jail, asked him to sacrifice himself for president 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."