Sen. Tom CottonThomas (Tom) Bryant CottonWhite House, Senate reach deal on trillion stimulus package The Hill's Morning Report - Presented by Airbnb - Trump, Dems close in on deal Overnight Defense: Navy hospital ship heading to Los Angeles | Military field hospitals to deploy to New York, Seattle | Pompeo flies to Afghanistan to revive peace process MORE (R-Ark.) on Sunday cast Hillary ClintonHillary Diane Rodham ClintonHillary Clinton on US leading in coronavirus cases: Trump 'did promise "America First"' Democratic fears rise again as coronavirus pushes Biden to sidelines Clintons send pizza to NY hospital staff treating coronavirus 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 TrumpTrump orders US troops back to active duty for coronavirus response Trump asserts power to decide info inspector general for stimulus gives Congress Fighting a virus with the wrong tools 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."