Economic Expert Veronika Grimm has warned the German coalition government against once again passing a potentially unconstitutional budget. If it is not possible to reform the strict rules limiting budget deficits, known as the debt brake, “then a good democrat must have the ambition to follow the rules. Or step down,” the economist from the Technical University of Nuremberg told Sunday’s edition of the mass-circulation Bild newspaper in comments seen in advance by dpa. The debt brake has been enshrined in the German constitution. Grimm, one of the five members of the German Council of Economi…