Trump has disregarded warnings to fill a top DOJ post, and it could signficantly impact the Russia probe

AP Photo/Evan Vucci President Donald Trump still hasn't nominated anyone to lead the Justice Department's tax division, which could pose problems for him ifFBI special counsel Robert Mueller approaches the division to pursue charges against the president or his associates for tax violations. The Daily Beast reported Thursday that Mueller has enlisted the IRS's criminal investigations unit (IRS-CI) as part of his probe into possible collusion between the Trump campaign and Russia. The move indica...