A fourth round of talks included a U.S. demand for a sunset clause that would end the agreement in five years, unless the three countries agreed to keep it in place, a provision U.S. Commerce Secretary Wilbur Ross has said would allow the countries to kill the deal if it was not working. Canadian Prime Minister Justin Trudeau met with the House Ways and Means Committee, since Congress would have to pass legislation rolling back the treaty's provisions if Trump tries to withdraw from the pact.