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.

Germany's opposition conservatives won parliamentary approval on Wednesday for a proposal to drastically restrict migration with the help of votes from the Alternative for Germany (AfD), breaking a taboo on cooperation with the far-right.

Friedrich Merz’s hard-line shift on migration is a calculated gambit by the German conservative leader to neutralize the far right and deliver a breakthrough with wavering voters, according to people familiar with his thinking.

German conservative leader Friedrich Merz on Wednesday defended his controversial migration reforms after stinging criticism from Chancellor Olaf Scholz, ahead of votes on two motions that could pass with the support of the far-right Alternative for Germany (AfD).