The Justice Department has fired more than a dozen lawyers, involved in criminal investigations into Donald Trump during his campaign for president, sources familiar with the matter confirmed to CNN,

President Trump’s pardons in the Jan. 6 case abruptly ended the most complex investigation in U.S. history. It also raised questions about what he will do next against a department he has said is full of his enemies.

The firings come as a Trump appointee opened an internal review of the department’s decision to charge hundreds of Jan. 6 defendants with felony obstruction offenses.