Growth in the massive U.S. services sector picked-up in December, according to the Institute for Supply Management. Meanwhile, job openings hit a six-month high in November, according to the Labor Department.

The companies argued in a lawsuit announced on Monday that Biden violated the Constitution by blocking the merger via a sham national security review that deprived the companies of their right to a fair process.

Nippon Steel, whose multibillion-dollar proposal to buy struggling US Steel was blocked by President Joe Biden last week, says it is considering taking legal action against the US government.