Former President Obama on Friday took a swipe at President TrumpDonald John TrumpNew EPA rule would expand Trump officials' powers to reject FOIA requests Democratic senator introduces bill to ban gun silencers Democrats: Ex-Commerce aide said Ross asked him to examine adding census citizenship question MORE over those who have been caught up in special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump Schiff says Intel panel will hold 'series' of hearings on Mueller report 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 PapadopoulosInquiry into origins of Russia investigation is a scam Trump accuses Democrats of crime amid rising calls for impeachment Comey: Trump peddling 'dumb lies' MORE, former Trump campaign chairman Paul ManafortPaul John ManafortREAD: Hannity, Manafort messages released by judge Manafort, Hannity talk Trump, Mueller in previously undisclosed messages FBI, warned early and often that Manafort file might be fake, used it anyway 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 to debate for first time as front-runner Top Trump ally says potential Amash presidential bid could be problematic in Michigan Chaotic Trump transition leaks: Debates must tackle how Democrats will govern differently 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.”