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 JohnsonTop cops deflect blame over Capitol attack NRSC chair Scott calls for party unity: 'The Republican Civil War is now cancelled' GOP senator raises uncorroborated claims about 'provocateurs,' 'fake Trump supporters' at Capitol riot hearing MORE (R-Wis.) said Sunday that Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonCruz: Wife 'pretty pissed' about leaked Cancun texts CBC would back Young for OMB if Tanden falls Hillary Clinton to co-write political thriller 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 TrumpRomney: 'Pretty sure' Trump would win 2024 GOP nomination if he ran for president Pence huddles with senior members of Republican Study Committee Trump says 'no doubt' Tiger Woods will be back after accident 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.