This short article argues that, at a time when national politics is being disfigured by angry populism, learning from progressive US cities can be inspirational. It explains how two counties in California took President Trump to court over his attempt to penalise 'Sanctuary Cities' and won. The landmark decision by District Court Judge William Orrick, on 20 November 2017, blocks Trump's executive order. The implications for local government in the UK are spelt out
