FILE - In this Dec. 7, 2018, file photo, President Donald Trump announces that he is nominating William Barr as his Attorney General, on the South Lawn of the White House, in Washington. Barr, once questioned the effectiveness of a border wall similar to the one the president now wants to construct. Barr was attorney general under President George H.W. Bush when he was asked in a 1992 interview if he supported a proposal from Republican challenger Pat Buchanan to erect a barrier of ditches and fences along the Mexican border to stem the flow of illegal immigrants. Barr described a side-to-side barrier as “overkill.” (AP Photo/Evan Vucci, File)