By Kevin Breuninger | @KevinWilliamB, CNBC

President Donald Trump's nominee for attorney general, William Barr, was confirmed in the Senate on Thursday to take over the Justice Department, where he will oversee special counsel Robert Mueller's Russia probe.

Barr, 68, was confirmed in a 54-45 vote that largely fell along party lines. He was sworn in Thursday afternoon in the Oval Office by Supreme Court Chief Justice John Roberts, the White House told NBC News.

Barr was widely expected to be confirmed by the Republican-majority Senate on Thursday. He had served in the same role more than two decades earlier in President George H.W. Bush's administration, and had passed procedural hurdles in the Senate Judiciary Committee and the full Senate in recent votes.

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The Happy Hamster
The Happy Hamster

May he have a productive stint as attorney general.