The federal agency has upheld — and in some cases increased — tariffs put in place earlier this year. The actions come as a result of a petition from two U.S. paper producers that said Canadian paper products are subsidized unfairly.

Sens. Angus King, an Independent, and Susan Collins, a Republican, say the subsidies put American mills at a huge disadvantage and the ITA’s decision is a step toward relief.

But the senators also say they are “extremely disappointed” that the ITA is moving forward with tariffs they say could hurt Maine workers employed by J.D. Irving and at a Catalyst-owned mill in Rumford. They called that move “misguided.”