Former President Obama says that if Republicans were truly concerned about the security risks posed by former Secretary of State Hillary ClintonHillary Diane Rodham ClintonAre Democrats turning Trump-like? The Hill's Campaign Report: Battle for Senate begins to take shape The Hill's Morning Report — Trump and the new Israel-'squad' controversy MORE's private email server, "they'd be up in arms" over reports that President TrumpDonald John TrumpTrump watching 'very closely' as Portland braces for dueling protests WaPo calls Trump admin 'another threat' to endangered species Are Democrats turning Trump-like? 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 BaldwinTrade wars and the over-valued dollar Overnight Health Care: Senate panel advances drug pricing bill amid GOP blowback | House panel grills Juul executives | Trump gives boost to state drug import plans | Officials say new migrant kids' shelter to remain open but empty Senators vow to bring transparency to drug pricing MORE, who faces GOP challenger Leah Vukmir.