UPDATE 1-Amid dispute, Bush still backs Dubai ports deal (Adds comments from Frist, new legislation from Bayh) By Caren Bohan and Susan Cornwell WASHINGTON, Feb 28 (Reuters) - President George W. Bush on Tuesday stood by his support for allowing a Dubai-based company to run terminals at six major U.S. ports, as lawmakers raised concerns about a Coast Guard report on security issues. "If there was any doubt in my mind or people in my administration's minds that our ports would be less secure or the American people in danger, this deal wouldn't go forward," Bush said,...