washington obama administration top supreme court lawyer leave office end june string major case include fend challenge president barack obama signature healthcare law legalize same-sex marriage solicitor general donald verrilli serve justice department post since june 2011. also hold two position obama administration verrilli deputy ian gershengorn take justice department say release announce verrilli departure five years solicitor general verrilli fight nation high court good future win landmark case move america forward obama say statement verrilli twice successfully defend 2010 affordable care act know obamacare conservative challenge 2012 court rule 5-4 uphold law broad legal attack three years late justices reject second challenge 6-3 vote thank efforts 20 million americans know security quality affordable health care obama say major victories verrilli urge justices strike federal defense marriage act bar recognition same-sex marriages purpose federal benefit 5-4 rule strike law june 2015 help pave way court 5-4 landmark 2015 decision legalize gay marriage nationwide verrilli also advocate another case verrilli successfully persuade court 2012 strike provision harsh anti-immigrant law arizona 5-3 vote many case thoughtful counsel principled advocacy build legacy inclusion expand opportunities civil right americans move country forward attorney general loretta lynch say statement setbacks include court 2013 rule 5-4 vote strike key provision vote right act law enact protect minority voters also lose case 9-0 company challenge obama authority appoint members national labor relations board senate recess court yet rule several major case verrilli argue year include challenge restrictive texas abortion law defense obama executive action would protect four million immigrants deportation obama 's supreme court lawyer step