The German parliament rejected an opposition draft law on tightening immigration policy on Friday, two days after the opposition conservatives were accused of breaching an agreement against cooperating with the far right for the first time.

The German parliament narrowly rejected on Friday an opposition-sponsored bill calling for tougher rules on migration that risked becoming the first draft legislation to pass thanks to a far-right party and became a focus of a controversy about the attitude of the front-runner in Germany’s upcoming election toward the far right.

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.