The U.S. Senate passed legislation Wednesday that would nullify U.S. tariffs on Canada, just as U.S. President Donald Trump is engaged in trade talks in Asia as well as an increasingly bitter trade spat with U.S.’s northern neighbour that is one of its largest economic partners.

The 50-46 tally was the latest in a series of votes this week to terminate the national emergencies that Trump has used to impose tariffs. While the resolutions won’t ultimately take effect, they have proven to be an effective way for Democrats to expose cracks between the president’s trade policy and Republican senators who have traditionally supported free trade arguments.