The Luxembourg-based company, whose Mittal Steel USA division is based in Chicago, opposed efforts to establish a mandatory cap on emissions of gases linked to climate change and lobbied on efforts to limit Chinese steel subsidies, according to the disclosure form posted online Aug. 14 by the Senate's public records office.

Besides lawmakers, the company lobbied the Environmental Protection Agency, the White House, the U.S. Trade Representative's Office and the departments of Commerce and State.

Among those registered to lobby on behalf of the company was Marcia Miller, a former commissioner at the U.S the International Trade Commission.

Under a federal law enacted in 1995, lobbyists are required to disclose activities that could influence members of the executive and legislative branches. They must register with Congress within 45 days of being hired or engaging in lobbying.