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Delegates from German Chancellor Angela Merkel's party have voted in favor of scrapping rules that allow the children of immigrants to be dual citizens.

Until two years ago, German-born children of immigrants had to pick one nationality between ages 18 to 23 — a rule largely affecting Germany's Turkish community. Merkel's current center-left coalition partners insisted on dropping the requirement as part of their price for entering the government after Germany's 2013 election.

That has never been popular with Merkel's conservative Christian Democratic Union. On Wednesday, delegates at a convention in Essen narrowly backed a motion from the party's youth wing that advocated returning to the old system.

The CDU's chances of achieving that look poor, however, as potential coalition partners after next year's election are highly unlikely to agree.