BERLIN (AP) — Chancellor Angela Merkel said Wednesday that it's in Germany's national interest for Britain to remain in the European Union, and she also pressed her fellow European leaders to work with Turkey to curb the migrant influx. An EU summit on Thursday and Friday aims to reach an agreement on a package of measures to keep Britain in the 28-nation bloc, and Merkel hopes to make some headway toward an elusive European solution of the migrant crisis. In a speech to parliament, Merkel painted a largely positive picture of chances of an agreement on Britain's EU reform demands. [...] she said, the key issue is to work with Turkey to try to stem the flow of migrants across the Aegean Sea to EU member Greece — a crossing that more than a million people made last year — rather than shutting down Greece's northern border with Macedonia.