[[Jeremy Corbyn]] udpegede Starmer som [[Skyggekabinet (Storbritannien)|skyggeminister]] for [[Home Office]] den 18. september 2015.<ref>{{cite web|url=https://www.parliament.uk/biographies/commons/Keir-Starmer/4514|title=Rt Hon Keir Starmer MP|author=UK Parliament|work=UK Parliament|accessdate=14. juli 2019}}</ref> Den 27. juni 2016 trådte han tilbage som skyggeminister i protest med ledelsen i Labour Party og støttede [[Owen Smith]] ved valget i september 2016 til Labours ledelse.<ref>{{cite web|url=https://www.itv.com/news/update/2016-06-27/keir-starmer-resigns-as-shadow-home-office-minister/|title=Keir Starmer resigns as shadow home office minister|author=ITV News|date=27. juni 2016|accessdate=14. juli 2019}}</ref><ref>{{cite news|url=https://www.mirror.co.uk/news/uk-news/mps-nominating-owen-smith-labour-8451186|title=Which MPs are nominating Owen Smith in the Labour leadership contest?|last1=Smith|first1=Mikey|date=20. juli 2016|work=Mirror|access-date=10. november 2018|last2=Bloom|first2=Dan|location=}}</ref> Efter at Jeremy Corbyn havde vundet afstemningen, udpegede Corbyn Starmer til [[Skyggekabinet (Storbritannien)|skyggeminister]] for [[Brexit]].<ref>{{cite web|url=http://www2.politicalbetting.com/index.php/archives/2016/10/06/jeremy-corbyn-has-appointed-sir-keir-starmer-as-shadow-brexit-secreretary-and-the-tories-should-be-worried/|title=Jeremy Corbyn has appointed Sir Keir Starmer as Shadow Brexit Secretary and the Tories should be worried|date=6. oktober 2016|website=politicalbetting.com|access-date=7. december 2016}}</ref>
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