Zambia’s Foreign Affairs Minister Joseph Malanji plans to send a protest letter to Washington over last week’s comments by the US ambassador on the jailing of a gay couple.

Japhet Chataba and Steven Samba were sentenced on Wednesday to 15 years in prison by the High Court in the capital, Lusaka, after they sought a review of their conviction handed last year by a magistrate’s court.

US Ambassador Daniel Foote reacted to the sentence by saying he “was personally horrified to read about the sentencing of two men, who had a consensual relationship, which hurt absolutely no-one”.

Malanji told journalists over the weekend that he will dispatch the protest letter on Monday saying to question the judiciary’s decision by a representative of a foreign government is tantamount to questioning the Zambian constitution.

Homosexuality is illegal in Zambia.

Zambia’s President Edgar Lungu has previously warned western countries that the country will not be forced to accept gay rights.