new york u.s. justice department appeal lawyer special counsel robert mueller team probe interference 2016 presidential election reuters learn scott meisler appellate attorney justice department criminal division one 16 lawyers sign probe one two previously identify peter carr spokesman mueller say meisler join team mid-june investigation like mueller former u.s. solicitor general donald verrilli say appeal lawyers would help determine whether conduct examine violate sometimes complex federal laws people spend career make difficult judgments area would quite valuable verrilli say appeal lawyers usually argue federal circuit court u.s. supreme court uphold overturn trial result solicitor general office represent u.s. government supreme court meisler one several appeal lawyers mueller legal team senior deputy solicitor general michael dreeben argue 100 case supreme court widely consider justice department top criminal law expert elizabeth prelogar assistant solicitor general another appeal lawyer team mueller appoint special counsel may look possible collusion trump campaign russia election among matter last week team begin interview former current white house officials accord person familiar matter russian officials deny meddle u.s. election trump deny collusion campaign 2005 georgetown university law center graduate fluent spanish speaker meisler current position since 2009 aside recent year-long stint assistant solicitor general represent government appeal involve search warrant seizures motion suppress wiretap evidence mail fraud wire fraud structure financial transactions money launder justice department appeal lawyer mueller russia probe