Former German Chancellor Angela Merkel has issued rare public criticism of her successor as the country’s center-right leader, the front-runner in Germany’s election next month, for putting to parliament proposals for tough new migration rules that only passed with the help of a far-right party.

BERLIN — Germany’s parliament is expected to vote Friday on an opposition bill calling for tougher rules on migration that could become the first legislation to pass thanks to a far-right party — adding to a controversy about the attitude of the front-runner in Germany’s upcoming election toward the far right.

The bill fell short of 12 votes on Friday. Twelve MPs from Merz’s parliamentary group were absent. The setback came after Merz passed a majority with AfD for a non-binding motion on migration earlier this week,

Germany’s conservative bloc requested a surprise recess in the lower house of parliament on Friday in a sign of the tension over plans to pass a hard-line immigration bill with backing of the far right.