Why did Horst Seehofer threaten to resign from Angela Merkel’s government in 2018?

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In June 2018, Horst Seehofer, who served as Germany’s interior minister and the head of the Christian Social Union (CSU), threatened to resign from Angela Merkel’s government due to a sharp disagreement over her immigration policy.12

The conflict between the conservative sister parties—Merkel’s CDU and Seehofer’s CSU—threatened to topple the German government at the time. Ultimately, Merkel demonstrated her capacity for compromise, which led Seehofer to rescind his provisional resignation.12