President Donald Trump on Thursday tapped David Kautter, a senior tax official at the Treasury Department, to become acting IRS commissioner, starting Nov. 13.Kautter will temporarily take over the top job at a critical time for the agency, as Republicans work on a major tax code overhaul and an IRS audit of the president’s own taxes continues. He will succeed Commissioner John Koskinen, the embattled IRS chief whose term ends Nov. 12. If a landmark GOP tax bill passes before the end of the year, as top Republicans intend, Kautter would have the monumental task of implementing the first major...