I despise the Eurowhiners but they are correct in this case. IMHO this is simply a bone to the unions. Nothing but a short-term political decision that won't result in too many new votes anyway. Quite sad actually.
What's even sadder to me is that I have a brother who works for a US steel maker but has to travel overseas to assist with the setup and design of plants in foreign countries because the federal government and enviro-whacko's have made it cost prohibitive for plants in the US to be either built or upgraded and modernized.
There are only two options. Either make it so that the US companies can build plants here that can compete with the foreign plants or apply tariffs.
One generates revenue for the government and the other doesn't. Which did you really think they'd do?