U.S. Attorney General William Barr has the potential to emerge as one of the few grownups to serve in the presidential administration of Donald J. Trump.

The Senate confirmed him this week with a 54-45 vote, which I thought was much closer and more partisan than I expected. However, he’s now the head guy at the Justice Department.

AG Barr’s task now is to make good on the pledges he made to the Senate Judiciary Committee during his confirmation hearing.

Barr said he wouldn’t be bullied by the president of the United States; he said special counsel Robert Mueller will be allowed to finish his exhaustive probe into alleged collusion between the Trump campaign and Russian election attacks; he has expressed faith in Mueller’s integrity and professionalism.

I have faith that Barr will make good on his pledge. This isn’t his first DOJ rodeo. Barr served as attorney general from 1991 to 1992 during the George H.W. Bush administration. He is a top-notch lawyer. Yes, he’s a partisan, but we should expect that from any AG regardless of his or her party affiliation.

So, Mr. Attorney General, I implore you to be faithful to your sworn statements in front of the entire nation, if not the world.