U.S. and Canadian officials are continuing daily negotiations ahead of an Aug. 19 deadline for proposed 50% U.S. tariffs on a broad range of Canadian imports, but Ottawa is dissatisfied with a new U.S. offer to reduce some tariffs because the relief falls short of what Canada had sought. President Donald Trump said last month the tariffs would be imposed unless Canada ends what he called discriminatory treatment of U.S.-made automobiles, alcohol and dairy products. The measures are estimated to affect about $20 billion of Canadian imports, with some estimates rising to $28 billion if no deal is reached. Trade Minister Dominic LeBlanc met U.S. Trade Representative Jamieson Greer in Washington on Aug. 11 for their third ministerial-level meeting in three weeks. Afterward, LeBlanc said Canada would remain at the negotiating table and continue working in good faith to defend its interests. CBC reported that Washington presented a revised proposal on Aug. 11 to scale back some tariffs, but the concessions did not meet Canada's expectations. The dispute has centered on Canada's 25% retaliatory tariff on U.S.-made vehicles, the near-total halt of U.S. alcohol purchases by Canadian provinces and Canada's dairy import quota system. The White House has said products covered by the United States-Mexico-Canada Agreement would not be exempt from the new tariffs, although energy, potash, seafood, critical minerals and goods already under separate tariffs would be excluded. Former Canadian Ambassador to the U.S. David MacNaughton said a comprehensive settlement may require direct talks between Prime Minister Mark Carney and President Trump, and warned that piecemeal concessions could leave Canada exposed to further tariff threats.