New Democrats say Conservative MPs were missing in action as Canadian parliamentarians visited Capitol Hill and met with American lawmakers and business leaders this week.

Canadian MPs and senators were in Washington on Tuesday and Wednesday as part of Parliament’s diplomatic efforts. The trip coincided with the start of the U.S.-Canada trade war.

In a social media post, NDP MP Brian Masse noted the Conservative MPs’ absence at a critical time.

“The Conservative House of Commons members are a no show despite having the most spots for our delegation,” posted Masse, who represents the border riding of Windsor West. “We even have the Bloc [Québécois] represented to show solidarity for all those who live in our great nation.”