Biden's administration is pushing for a 15 percent global minimum corporate tax that aims to resolve the issue of corporations sheltering profits in low-tax nations.
The US representative and the Canadian minister also discussed the protracted litigation over Canadian lumber. Washington believes that this wood is sold below the market price to promote exports.
Tai said in a statement that Myanmar security forces' killing of peaceful protesters, students, workers and labor leaders and children "has shocked the conscience of the international community."
"These actions are a direct assault on the country's transition to democracy and the efforts of the Burmese people to achieve a peaceful and prosperous future," said Tai, who was sworn into office on March 18.