The Senate will vote Tuesday on a motion to consider assistant attorney general nominee Thomas Perez, whose selection has stalled for four months. Majority Leader Harry Reid (D-Nev.) filed a procedural motion to move ahead on the nomination Monday evening. A vote on that motion is scheduled for Tuesday, and if it passes by a 60-vote majority, a final vote on Perez’s nomination could occur by the end of the week.Republicans, led by Judiciary Committee ranking member Jeff Sessions (R-Ala.) and Sen. John Cornyn (R-Texas), have held up action on the nomination over concerns that he might “use the post to undermine immigration law enforcement,— according to a GOP aide. The Senate Judiciary Committee voted 17-2 in favor of Perez’s nomination on June 4.