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.

The move, approved by 87% of members who voted, allows the union’s bargaining team to issue a 10-day strike notice to the city.

With a $40 million gap between union demands and the city’s offers, Portland is bracing for a possible strike as negotiations remain unresolved.

City of Portland workers vote to strike if agreement isn't reached