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The fate of Chancellor Angela Merkel’s ruling bloc is due to be decided on Monday as a coalition dispute over migration policy reaches its endgame.

Separate meetings of Merkel’s Christian Democratic Union and its Bavarian sister party broke up well after midnight with no public resolution to their standoff. The parties will hold joint talks in Berlin later on Monday in an attempt to broker an eleventh-hour compromise.

Interior Minister Horst Seehofer, who heads the Bavarian Christian Social Union, said he had proposed resigning from Merkel’s cabinet, but put the threat on hold to allow for more talks with the CDU in the hope of reaching an understanding “for the sake of the country” and the coalition government.