berlin senior members chancellor angela merkel conservative bloc potential coalition partner back idea immigration law possible way help solve germany migrant policy jigsaw merkel fourth term sept. 24 election albeit heavy losses anti-immigrant far right consider three-way coalition pro-business free democrats fdp environmentalist green tie-up yet untested national level germany among various differences migration shape major stick point due insistence conservatives bavarian sister party christian social union csu refugee cap almost one million migrants pour country 2015 tens thousands since formal cap reject party well merkel president frank-walter steinmeier bring issue fore tuesday say speech german policy must able differentiate political refugees economic migrants define legal access germany green co-leader cem ozdemir long argue immigration law welcome intervention president center-left social democrat would wise step ozdemir tell deutschlandfunk radio wednesday say implement idea would urgent priority next government steinmeier foray domestic politics unusual presidency largely ceremonial post though sometimes strong moral influence least generate convergence immigrant issue among potential coalition ally armin laschet christian democratic premier north rhine-westphalia germany populous state tell handelsblatt daily cdu/csu-fdp-greens coalition would create immigration law cover scale immigration remark die zeit weekly bavarian economy minister ilse aigner stick csu demand annual cap 200,000 immigrants prevent recurrence 2015 crisis backdoors stay open lack clarity party argue cap would breach constitution guarantee asylum people persecute political ground concern immigration run especially high bavaria main entry point refugees 2015 close million many flee war poverty middle east africa cascade country idea immigration law new several party argue past many experts argue could help germany economy target legally control migration could plug gap labor market devil would detail fdp keen point system cite canadian model variants countries new zealand australia unclear whether immigration law enough csu risk heavy losses state election next year senior csu figure still dig heel transport minister alexander dobrindt tell augsburger allgemeine upper limit necessary lot matter semantics first german immigration law agenda merkel seek coalition