An upstart German party that combines an anti-euro stance with tough talk on immigration has called off a planned congress amid increasingly ugly infighting over its leadership and future course.

Alternative for Germany, founded two years ago, won seats in the European Parliament last year and has entered five state legislatures in regional elections over recent months.

It initially focused on talk of ending the euro currency in its current form, but many members increasingly have centered their pitch around tough talk about immigration and crime. That has been accompanied by public backbiting among its leaders.

Party spokesman Christian Lueth said Tuesday that the leadership decided to call off a congress planned for June 13-14 because of "legal concerns."