dog whistle issue
n.— «Every election introduces a new phrase into the political lexicon and the “dog-whistle issue” is 2005’s early contribution. Coined by Lynton Crosby, the strategic guru imported from Australia by Michael Howard, it refers to those policies that summon back voters who have gone astray.» —“Beware the nasty nudge and wink” by Jonathan Freedland Guardian (U.K.) Apr. 12, 2005. (source: Double-Tongued Dictionary)