a CSU official told The Wall Street Journal that Mr. Seehofer, addressing senior party colleagues in Munich on Sunday, had labeled Friday’s deal as insufficient and not meeting the conditions he had set to postpone his proposed closure of Germany’s borders. While the deliberations continued, Mr. Seehofer’s comments appeared to steer Europe’s largest country toward a full-blown government crisis. Should Ms. Merkel fire Mr. Seehofer and end their respective parties’ seven-decade alliance, she would find her coalition without a majority in parliament. Mr. Seehofer would make an announcement later Sunday, the CSU official said, declining to say whether the party...