By Christine Chen and Jorge Nieto SYDNEY/GOLD COAST, Australia (Reuters) -Australia's film industry wants actor Mel Gibson to do what he does in his action-hero movies and save the day, by convincing U.

Declaring foreign film production a national security threat, the president said he had asked his top trade official to start the process of imposing a tax on Hollywood.

President Donald Trump is directing his attention Monday on foreign films, threatening in a social media post tariffs on movies produced outside of the United States.