President-elect Donald Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE is expected to nominate Robert Lighthizer to be the U.S. trade representative, making one of his last remaining Cabinet selections, according to reports.

A transition official confirmed to The Washington Post on Monday night that Trump was expected to tap the Reagan administration veteran for the position. His selection is expected to be formally announced as early as Tuesday.

Lighthizer, who served as deputy U.S. trade representative under President Reagan, has been the leading candidate for the position for some time, according to The Wall Street Journal.

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In his role, Lighthizer will be part of a team responsible for executing the agenda outlined by Trump on confronting China and Mexico over trade issues, a major component of his populist campaign.

The position is one of four major spots left in Trump's Cabinet, along with secretaries of the departments of Veterans Affairs and Agriculture and chairman of the Council of Economic Advisers.