Former President Obama on Friday took a swipe at President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE over those who have been caught up in special counsel Robert MuellerRobert (Bob) Swan MuellerLewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation 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 PapadopoulosUS attorney recommends moving forward with charges against McCabe after DOJ rejects his appeal 10 declassified Russia collusion revelations that could rock Washington this fall Flynn, Papadopoulos to speak at event preparing 'social media warriors' for 'digital civil war' MORE, former Trump campaign chairman Paul ManafortPaul John ManafortUkraine could badly damage both Donald Trump and the Democrats Lewandowski refuses to say whether Trump has offered him a pardon Democrats return to a battered Trump 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 ClintonDemocrats go all out to court young voters for 2020 Pelosi: Whistleblower complaint 'must be addressed immediately' Election meddling has become the new normal of US diplomacy 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.”