MILWAUKEE — House Speaker Paul Ryan said Saturday he thinks President Donald Trump will be an asset to GOP candidates this fall in states like Wisconsin that he narrowly won, even as he warned fellow Republicans that a “blue wave” could wipe out advancements made during his presidency. Ryan addressed about 600 people at the Wisconsin Republican convention, his final one after 20 years in office. The state’s entire GOP congressional delegation, along with Gov. Scott Walker, honored Ryan, who received a standing ovation and chant from the audience of “Thank you, Paul!” Ryan told delegates he was surprised on...