The United States and Mexico have reached a preliminary agreement resolving key bilateral trade issues.

President Donald Trump made the announcement from the Oval Office.

The agreement between the two countries could restart negotiations on NAFTA with all three parties – the United States, Mexico and Canada.

“Canada is encouraged by the continued optimism shown by our negotiating partners,” said a spokesperson for Canadian Minister of Foreign Affairs Chrystia Freeland.

“Progress between Mexico and the United States is a necessary requirement for any renewed NAFTA agreement,” he said.

Negotiations on rewriting the three-country NAFTA agreement began about a year ago.

The 24-year-old trade agreement generally prevents the three parties from imposing tariffs on imports from one another. But Trump has called the agreement “the worst deal maybe ever signed” and moved ahead with tariffs earlier this year.

In May, the United States imposed steep tariffs on steel and aluminum from much of the world, including Mexico. In response, Mexico slapped tariffs on $3 billion of US goods, including steel, pork, apples, potatoes, bourbon and different types of cheese.

Canada imposed tariffs on $12.5 billion of US goods, including steel, toffee, maple syrup, coffee beans and strawberry jam.