Can I force my brother to provide me a copy of our deceased Father's Trust?

Our Father died in December, 2012. He had a Irrevocable Trust of which my brother is the Trustee. I never saw the document. After repeated requests my brother sent to me a "copy" of the Trust. It was dated 2005, listed Dad's insurance policies, listed his address as the house Dad lived in but sold in 2007 (he moved to another home which is not mentioned), and it does not mention distribution of personal assets. The signature pages are not signed nor is anything in notarized. I can't see how this would be a legal document. I live and work in Utah while my brother resides in California.