GOP senator: Did Clinton email setup play a role in Russian invasions?
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Senate Homeland Security and Governmental Affairs Committee Chairman Ron JohnsonRonald (Ron) Harold JohnsonGOP senator: 'No problem' with Mueller testifying The Hill's Morning Report — Category 5 Mueller storm to hit today GOP senators double down on demand for Clinton email probe documents MORE (R-Wis.) said Sunday that Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonForget the spin: Five unrefuted Mueller Report revelations Former senators launching effort to help Dems win rural votes Biden's announcement was a general election message, says political analyst MORE's use of a private email server while secretary of State could have played a role in Russia's invasion of Crimea and eastern Ukraine. 

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"You have to assume that our enemy and adversaries had to have had access to every email that ever went over her private server," Johnson said on CBS's "Face the Nation." 

"Did it affect their actions — as it's related to, for example, [Russian President] Vladimir Putin's invasion of Crimea or eastern Ukraine? What about the negotiations with Iran? What about Assad?" 

Johnson, who has shied away from formally endorsing presumptive GOP nominee Donald TrumpDonald John TrumpForget the spin: Five unrefuted Mueller Report revelations Lara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' Financial satisfaction hits record high: survey MORE, has been a vocal critic of Clinton. 

Republican criticism of Clinton has escalated during the past week after a watchdog report showed she didn't comply with the State Department's record-keeping policies and used a personal server without permission while secretary of State.