Via the FT:
Horst Seehofer, the German interior minister, has set Angela Merkel an ultimatum, saying he would resign unless the chancellor acceded to his demands for tougher controls on the German border.
It was the latest development in a conflict that could threatens to shatter the alliance between Mr Seehofer’s Bavarian CSU party and Ms Merkel’s CDU, a union that has formed the bedrock of German politics for nearly 70 years.