The Japanese steelmaker aims to complete the takeover of United States Steel Corp before President-elect Donald Trump, who had vowed to block the acquisition during his campaign, assumes office in January.

Nippon Steel Corp. is promising unionized workers of United States Steel Corp. that it won’t send steel shipments from its overseas mills as part of its commitments to seal a $14.1 billion takeover of the iconic American company.

The US Commerce Department has ratcheted up tariffs on Nippon Steel Corp. just as the Japanese steelmaker made an anti-import promise to gain support for its $14.1 billion takeover of United States Steel Corp.

Nippon Steel is promising not to import steel from abroad to the United States as it tries to save $14.9 billion acquisition of U.S. Steel.