Former President Obama says that if Republicans were truly concerned about the security risks posed by former Secretary of State Hillary ClintonHillary Diane Rodham ClintonDemocrats worry they don't have right candidate to beat Trump Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates MORE's private email server, "they'd be up in arms" over reports that President TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 BaldwinIt's time for Congress to establish a national mental health crisis number The Hill's Morning Report - Presented by Better Medicare Alliance - Dems unveil impeachment measure; Vindman splits GOP The Hill's Morning Report - Presented by Better Medicare Alliance - Dems shift strategy on impeachment vote MORE, who faces GOP challenger Leah Vukmir.