He said his party “will vote to bring this government down” in a letter published on X on Friday.
In return for support on their common political agenda, the NDP leader, whose center-left party supported Trudeau’s minority government through multiple no-confidence votes this year, is making a change.
It concludes a challenging week for the Canadian prime minister, who is increasingly being pressured to leave his own Liberal Party after his top cabinet member resigned on Monday.
“The Liberals don’t deserve another chance,” Singh wrote in his letter, vowing to “put forward a clear motion of non-confidence in the next sitting of the House of Commons.”