German Chancellor Angela Merkel's conservatives toughened their tone on integrating migrants on Wednesday, passing a resolution on tackling forced marriage and honour killings, and cracking down on dual citizenship.

A day after Merkel called for a ban on full-face Muslim veils "wherever legally possible", her Christian Democrats (CDU) endorsed that message and stressed the values they want the 890,000 migrants who arrived in Germany last year to adopt.

Merkel, who implored the party on Tuesday to help her win a fourth term in office at federal elections next year, told N-TV at the end of a two-day CDU party conference that individual criminals among the migrants must be found and prosecuted.

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