U.S. Steel shares were down nearly 3%.
sees the effects as a "relative tactical positive" for steel companies, including U.S. Steel X and AK Steel AKS .
Executives of 25 U.S. steel and steel-related firms wrote to the President on Wednesday, saying the industry is languishing from government inaction.
Donald Trump's border wall could mark a major payday for some companies -- if it gets built.
Carl Icahn has had quite the career.