Former prime minister Jean Chrétien says famed architect Frank Gehry had talked to him about moving back to Canada after the election of U.S. President Donald Trump last year. Mr. Gehry was born in Toronto but lost his Canadian citizenship after his family moved to Los Angeles in 1947, when dual citizenship was not an option. Mr. Chrétien, who was a close friend of Mr. Gehry, restored the architect’s Canadian citizenship when he was prime minister in 2002. The architect then held dual citizenship. “I gave him back his Canadian citizenship. He was sworn in as a Canadian in my...