In the past, Liberals (under Chretien and then Martin) voted in favour of this resolution. Stephen Harper's government voted against it, and Trudeau's government continues to vote against it.
So, Trudeau is continuing where Harper left off. Liberal Tory same old story.
See link for more details:
When the Reform Party took over the Conservative Party the Cons all moved to the Liberal Party and the Liberals to the NDP
That was Harper’s doing but it took years for it to be realized
For those that seek a future that brings together the best of the insights and objectives of people who, within the social democratic and democratic socialist traditions, have worked through farmer, labour, co-operative, feminist, human rights and environmental movements, and with First Nations, Métis and Inuit peoples, to build a more just, equal, and sustainable Canada within a global community dedicated to the same goals.