The union membership rate dropped by one-tenth of a percentage point to a new low of 9.9 percent last year, the Labor Department said Tuesday, while the total number of union members in the United States barely budged last year, with a loss of roughly 100,000 members.

U.S. union membership levels declined slightly to record lows last year, a government report said on Tuesday, and now organized labor faces fresh challenges from President Donald Trump's return to the White House.