Former President Obama on Friday took a swipe at President TrumpDonald TrumpPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Biden flexes presidential muscle on campaign trail with Virginia's McAuliffe Has Trump beaten the system? MORE over those who have been caught up in special counsel Robert MuellerRobert (Bob) MuellerSenate Democrats urge Garland not to fight court order to release Trump obstruction memo Why a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel MORE's probe.

"They promised to take on corruption. Remember that?" Obama said while going after Trump and Republicans during a Democratic campaign event in Milwaukee.

"They have gone to Washington and just plundered away. In Washington, they have racked up enough indictments to field a football team," he said.

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"Nobody in my administration got indicted." 

As of this month, Mueller's team has indicted or secured guilty pleas from 32 people as part of his sprawling probe into Russian meddling in the 2016 election.

Four of those people include former Trump campaign adviser George PapadopoulosGeorge Demetrios PapadopoulosTrump supporters show up to DC for election protest Trump pardons draw criticism for benefiting political allies Klobuchar: Trump 'trying to burn this country down on his way out' MORE, former Trump campaign chairman Paul ManafortPaul John ManafortLobbyist Tony Podesta returns to work for Huawei Former bank CEO convicted of bribery in scheme to land Trump admin job Trial begins for Chicago banker who exchanged loans with Manafort for Trump job MORE, former Trump campaign aide Richard Gates and Trump's former national security adviser, Michael Flynn.

Trump has repeatedly slammed the investigation as a partisan "witch hunt" and called for it to be ended.

Obama on Friday also took aim at Republicans who criticized Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonBiden flexes presidential muscle on campaign trail with Virginia's McAuliffe Shontel Brown gaining ground against Nina Turner in Ohio: poll Biden hits trail for McAuliffe in test of his political brand MORE's emails during the 2016 election cycle. He alluded to a New York Times report this week that said Russia and China are eavesdropping on Trump’s personal phone calls.

"They didn't care about emails," Obama said. "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. It turns out, I guess it wasn't that important.”