Canada said it is disappointed the United Kingdom has decided to "off-load their responsibilities" after its close ally revoked the citizenship of a British-Canadian man who is imprisoned in Syria.
Canadian Public Safety Minister Ralph Goodale "Canada is disappointed that the United Kingdom has taken this unilateral action to off-load their responsibilities."
A statement from the British Home Office said revoking British citizenship is one way it counters terrorist threats. It said it does not comment on individual cases.
In 2015, Letts posted on Facebook that he would like to perform a "martyrdom operation" on a group of British soldiers. But by the end of that year, he was indicating that he wanted to come home.
The man's parents are from Oxford and were found guilty earlier this year of sending him money. They received a suspended sentence.