For over two months, Paramjit Singh, 48, a US green card holder battling a brain tumour and a heart condition, has been held in a detention centre by US immigration authorities. Mr Singh, an Indian passport holder, has lived in the US on a green card since 1994. He lives in Indiana with his family, who own a chain of gas stations. His wife and two children are US citizens. But Mr Singh now faces the threat of deportation. On 30 July, he was detained by immigration authorities at Chicago O'Hare