• Family of Chad Joseph believe he was killed in US strike on Tuesday
• Relatives say Joseph was a fisherman, call his death ‘perfect murder’
• Legal experts, Democrats raise concerns about legality of strikes

LAS CUEVAS, Trinidad and Tobago, Oct 16 (Reuters) - Relatives of a Trinidadian man who say he was killed in a U.S. military strike on a boat in the Caribbean this week are demanding evidence to back up allegations by U.S. President Donald Trump that those who died were trafficking drugs.

Trump has ordered a large U.S. military buildup in the southern Caribbean and U.S. troops there have conducted at least six strikes on boats the administration says were involved in drug trafficking, without providing evidence.