Former President Obama says that if Republicans were truly concerned about the security risks posed by former Secretary of State Hillary ClintonHillary Diane Rodham ClintonTrump escalates fight against mail-in voting Sunday shows preview: States begin to reopen even as some areas in US see case counts increase The Electoral College is not democratic — nor should it be MORE's private email server, "they'd be up in arms" over reports that President TrumpDonald John TrumpBiden slams Trump in new ad: 'The death toll is still rising.' 'The president is playing golf' Brazil surpasses Russia with second-highest coronavirus case count in the world Trump slams Sessions: 'You had no courage & ruined many lives' MORE is still using unsecured iPhones.

“In the last election it was Hillary’s emails. ‘This is terrible.’ ‘Hillary’s emails!’ We were hearing Hillary’s emails everywhere,” Obama said Friday at a campaign rally in Milwaukee.

"They didn't care about emails. And you know how you know? Because if they did, they'd be up in arms right now as the Chinese are listening to the president's iPhone that he leaves in his golf cart,” he continued. “It turns out, I guess it wasn't that important.”

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The New York Times reported Wednesday that Russia and China are eavesdropping on Trump’s personal phone, which he still uses despite repeated requests from national security officials that he stick to more secured landlines.

A day later, NBC News reported that officials are increasingly concerned that Trump is using unsecured cellphones to discuss sensitive matters with informal advisers.

Trump pushed back against the Times's report on Thursday, calling it “soooo wrong” in a tweet.

Obama made his remarks while headlining a campaign rally for Wisconsin state Superintendent Tony Evers, who is running to unseat Republican Gov. Scott Walker, and Democratic Sen. Tammy BaldwinTammy Suzanne BaldwinKlobuchar and Harris could bolster Biden in the Midwest Legal challenges to stay-at-home orders gain momentum Democrats press USDA on worker safety at meat processing plants MORE, who faces GOP challenger Leah Vukmir.