OTTAWA -- Liberals from western Canada are trying to show solidarity with their government after Prime Minister Justin Trudeau's approval of Kinder Morgan's Trans Mountain pipeline.

But frustration is evident as MPs gather for weekly caucus meetings on Parliament Hill.

Liberal Hedy Fry, who represents the riding of Vancouver Centre, says she's unhappy with the pipeline decision, fearing it could cost her votes in the next federal election.

Other B.C. MPs say they will talk to constituents in the coming days about the decision, with some like Pam Goldsmith-Jones saying the decision is in the best interests of all Canadians.

Goldsmith-Jones says the decision shouldn't be seen as a betrayal of West Coast voters, including those in her southwest B.C. riding.

North-Seymour MP Terry Beech -- whose name and concerns Trudeau specifically mentioned in his news conference Tuesday -- says he will hold an open house this weekend for his constituents.

The pipeline would link Alberta to the southern B.C. coast around Vancouver, and is opposed by environmental groups, First Nations communities and local politicians, including Vancouver Mayor Gregor Robertson.