In a new op-ed published in The Hill, UFCW President Joe Hansen homed in on the president’s speech at the 2009 AFL-CIO convention. Obama at the time said union members could keep their insurance under the law, but Hansen writes “that the president’s statement to labor in 2009 is simply not true for millions of workers.”

Republicans have long attacked Obama’s promise that “nothing in this plan will require you to change your coverage or your doctor.” But the fact that unions are now noting it as well is a clear sign that supporters of the law are growing anxious about the law’s implementation.

Many UFCW members have what are known as multi-employer or Taft-Hartley plans. According to the administration’s analysis of the Affordable Care Act, the law does not provide tax subsidies for the roughly 20 million people covered by the plans. Union officials argue that interpretation could force their members to change their insurance and accept more expensive and perhaps worse coverage in the state-run exchanges.