Attorney General William Barr announced his resignation earlier this month, but Wednesday officially marks his final day on the job. In a farewell message, Barr thanked the Justice Department staff and said "it has been a great honor" to serve in the role for a second time (he was previously President George H.W. Bush's attorney general).
Barr was long considered one of President Trump's closest allies, but a rift seemingly grew between the two in recent weeks after Barr didn't buy into Trump's efforts to overturn the presidential election and said his department found no evidence of widespread voter fraud.
Since then, per The New York Times, Barr has reportedly told associates he's been alarmed by Trump's behavior in recent weeks, and the Times also reports the president's most recent slate of controversial pardons appear to have bypassed the traditional Justice Department review process, which would likely have found that more than half of the cases did not meet its standards. Read more at The New York Times.