Germany's parliament descended into heckles and recriminations on Wednesday after a "firewall" against working with the far-right cracked.

A non-binding motion calling for tougher border and asylum rules passed with support from the far-right Alternative for Germany (AfD). During the stormy session, politicians of various parties hurled criticism and blame at each other.

Conservative CDU leader Friedrich Merz, who tabled the plans, defended his actions as "necessary". But Chancellor Olaf Scholz slammed the move as an "unforgivable mistake".