WASHINGTON (Reuters) - Democratic presidential hopeful John Edwards, targeting a potential Republican rival in 2008, dubbed plans for a short-term U.S. troop increase in Iraq "the McCain doctrine," in an interview aired on Sunday. Sen. John McCain of Arizona, considered likely to be a Republican candidate for president, has been "the most prominent spokesperson for this for some time," Edwards said in an early salvo of the 2008 campaign. Edwards, a former senator who was the Democratic vice presidential nominee in 2004, made his remarks in an interview on the ABC News program "This Week." MORE ON THIS STORY