Former President Obama says that if Republicans were truly concerned about the security risks posed by former Secretary of State Hillary ClintonHillary Diane Rodham Clinton5 things to know about Boris Johnson Trump says Omar will help him win Minnesota The Hill's Morning Report — Trump applauds two-year budget deal with 0 billion spending hike MORE's private email server, "they'd be up in arms" over reports that President TrumpDonald John Trump5 things to know about Boris Johnson Conservatives erupt in outrage against budget deal Trump says Omar will help him win Minnesota 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 BaldwinThe Hill's Morning Report — Trump applauds two-year budget deal with 0 billion spending hike Overnight Health Care: Trump official knocks public option | House drug pricing bill coming in September | HHS holds off on enforcing new family planning rules | FDA launches anti-vaping ads The Hill's 12:30 Report: Trump targets Mueller ahead of testimony MORE, who faces GOP challenger Leah Vukmir.