Mark Corallo, a spokesman for President Trump's outside legal team, has resigned.

In an email to the Washington Examiner early Friday morning, Corallo confirmed his move by saying simply, "I resigned."

John Santucci, a senior editorial producer at ABC, first reported the news late Thursday, and the Washington Post also reported Corallo's ouster.

Corallo has been putting out statements on behalf of Marc Kasowitz, Trump's personal lawyer who is representing the president in any matter concerning the investigations into Russian interference in the 2016 election and possible collusion with the Trump campaign.

Corallo, a former spokesman for the Justice Department, reportedly had been pushing back against any public criticism of Robert Mueller, who is the special counsel running the federal probe looking into Russian meddling.

Politico reported, citing an unnamed person who spoke with Corallo, that he no longer needed the money and had complained there was "too much fighting all the time" in the White House and that there was too much conflict among the lawyers.

Mueller's investigation is reportedly investigating whether Trump obstructed justice, and on Thursday, Bloomberg reported that the probe is parsing through Trump's business dealings.

The Washington Post report said Trump's legal team is exploring ways to undermine Mueller and is examining the scope of Trump's pardoning ability, including for himself.

It was reported earlier this month that Jamie Gorelick, an attorney for Jared Kushner, who is a top adviser and son-in-law to Trump, was dropping her responsibilities in defending Kushner on issues related to various Russia probes.

Kelly Cohen contributed