H. Rodgin Cohen, chairman of the New York law firm Sullivan & Cromwell, has withdrawn his name from consideration for deputy Treasury secretary, becoming the fourth pick for a prominent Treasury Department post to pull out in recent weeks. A prominent attorney who has advised many of the top Wall Street firms, Cohen dropped out after the White House found an issue during his vetting process, two sources familiar with the matter said. The sources declined to identify the reason. Cohen did not respond to messages seeking comment.