** Shares of U.S. media firms fall premarket after President Trump orders 100% tariff on movies produced outside the country to save 'dying' Hollywood

** Among the hardest hit stocks before the bell are Netflix NFLX.O, down 5%, and Warner Bros Discovery WBD.O, off 3%

** Trump on Sun called other countries' incentives to lure filmmakers a national security threat, and said he was authorizing the relevant government agencies, such as the Department of Commerce, to immediately begin the process of imposing the tariff

** It was unclear, however, if the tariffs would apply to movies on streaming services as well as those shown in theaters, as Hollywood executives tried to sort out details

** Walt Disney DIS.N down 2%, Paramount Global PARA.O down 2% and Comcast CMSCA.O dips 0.5% premarket

** Shares of Amazon.com AMZN.O, which recently took creative control of the 'James Bond' franchise, down 1.6%

(Lance Tupper is a Reuters market analyst. The views expressed are his own)

((lance.tupper@tr.com 1-646-279-6380))