A coalition of U.S. business groups fighting President Donald Trump's trade tariffs has launched an advertisement aimed at telling voters ahead of the midterm elections that the measures are costing American businesses and consumers $1.4 billion a month.

The group says that in Michigan, a state with several competitive elections this fall, tariff costs tripled in August from a year earlier, while they more than doubled in places like Texas, Illinois and West Virginia.

Nationally, there was a 45 percent uptick in August compared with the previous August — and the organization cautions not all of the tariffs have gone into affect.