WASHINGTON - Sen. Jeff Flake, R-Ariz., renewed his challenge to President Donald Trump with a long speech on Wednesday that drew parallels between Trump's verbal assaults on the media and terms used by one of the most notorious dictators of the 20th century.Flake, a frequent Trump critic who has decided to retire rather than seek re-election this year, compared the president's use of words such as "enemy of the American People" to the "enemy of the people" phrase that Russian dictator Joseph Stalin used against his critics during his reign of terror.