Berlin CNN — Huge crowds of protesters are set to descend on cities in Germany this weekend, as demonstrations calling for a ban on the far-right Alternative for Germany (AfD) gain momentum. Tens of thousands have already braved sub-zero temperatures this week to protest against the party, after it emerged senior AfD members discussed a plan to deport migrants en masse in revelations that have been compared to the Nazi era. Protests of up to 30,000 people have already taken place in cities including Berlin, Leipzig, Rostock, Essen and Cologne. Demonstrators gathered outside the capital’s redbrick town hall on Wednesday...