Democratic president candidate Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE joined other 2020 candidates in calling for impeachment proceedings after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's Wednesday statements on his report.

"This is as close to an impeachment referral as it gets," Buttigieg tweeted. "Robert Mueller could not clear the president, nor could he charge him — so he has handed the matter to Congress, which alone can act to deliver due process and accountability."

This is as close to an impeachment referral as it gets. Robert Mueller could not clear the president, nor could he charge him — so he has handed the matter to Congress, which alone can act to deliver due process and accountability. — Pete Buttigieg (@PeteButtigieg) May 29, 2019

Several other candidates also called for impeachment after the speech in which Mueller said that his team was not confident that the president did not commit a crime.

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“After that investigation, if we had confidence that the president clearly did not commit a crime, we would have said that,” the special counsel said.

He added that the Constitution requires a "process other than the criminal justice system" to act against a sitting president.

Buttigieg is among two dozen people vying for the 2020 Democratic presidential nomination.