The One Nation group of centrist Tories is considering tabling amendments to Rishi Sunak’s Rwanda bill to protect the controversial legislation against breaches of international law.

Conservative MPs on the party’s moderate wing are concerned the government could cave in to demands from the right to harden the bill to avoid them voting it down in the new year.

Former justice secretary Robert Buckland, a member of the One Nation group, is considering tabling an amendment of his own to make the bill legally more safe so it is compatible with the European convention on human rights, the Guardian can reveal.