More than 500 companies and 140 industry groups signed a letter from an organization called Tariffs Hurt the Heartland.

In response to threatening tweets by President Trump over the weekend, China is reportedly considering canceling a planned trip to Washington by trade negotiators later this week.

Business groups line up behind proposed legislation that would limit Trump's tariff powers.

Corporate America's spending on lobbyists has risen dramatically as companies strive to minimize the damage from changes in trade rules.

Facing higher costs for imported materials, industry groups are thinking outside the box to try to get through to the Trump administration.

Traditional lobbying methods aren't working well, but that has only increased the money flowing into K Street firms.

As Trump tariffs bite, firms dangle cash prizes in lobbying push.

U.S. companies and business groups are lining up to oppose the Trump administration's plan to slap tariffs on Chinese imports, as the two nations…