After the CDU's electoral defeat in Mecklenburg-Western Pomerania, tensions in the CDU-CSU union have intensified. Bavarian State Premier Horst Seehofer has blamed Merkel's refugee policy for the AfD's success.

In Tuesday's edition of the daily newspaper "Süddeutsche Zeitung," Horst Seehofer, the Bavarian state premier and leader of the Christian Social Union (CSU), said Sunday's "disastrous" election result was a consequence of Chancellor Angela Merkel's refugee policy.

Seehofer has been a long-time vocal critic of Merkel's open-door policy since the chancellor allowed some 1 million refugees to cross Germany's borders last year.

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