Big companies in the United States from Amazon.com Inc to Toyota Motor Corp and Alcoa Corp are working to counter the effect of the Trump administration's trade policies and to head off new tariffs. Companies are attempting to avoid any confrontation with U.S. President Donald Trump but want to exert as much influence as they can to dissuade him from tearing up trade agreements or introducing tariffs on a wide swath of imports. Amazon, the world's largest online retailer and cloud-computing company, which could be hurt by tariffs on items sold through its website and ...