Former President Obama says that if Republicans were truly concerned about the security risks posed by former Secretary of State Hillary ClintonHillary Diane Rodham ClintonHillary Clinton brings up 'Freedom Fries' to mock 'cancel culture' Edie Falco to play Hillary Clinton in Clinton impeachment series White House defends Biden's 'Neanderthal thinking' remark on masks MORE's private email server, "they'd be up in arms" over reports that President TrumpDonald TrumpTrump State Department appointee arrested in connection with Capitol riot Intelligence community investigating links between lawmakers, Capitol rioters Michelle Obama slams 'partisan actions' to 'curtail access to ballot box' 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 BaldwinDemocrats push Biden to include recurring payments in recovery package Biden signs supply chain order after 'positive' meeting with lawmakers Democrats want businesses to help get LGBT bill across finish line MORE, who faces GOP challenger Leah Vukmir.