Canada’s main opposition leader on Saturday called for Prime Minister Justin Trudeau to be tougher on Beijing in resolving trade disputes between the two countries and securing the release of detained Canadians.

Relations have deteriorated between China and Canada following the December arrest in Vancouver of Meng Wanzhou, a top official in China’s telecom giant Huawei, who is wanted by the United States for allegedly circumventing sanctions on Iran.

Since then, Chinese authorities have arrested two Canadians on suspicion of espionage and blocked imports of Canadian agricultural products, moves Beijing says are unrelated to the Huawei case.

“Trudeau must make it clear to China that there are consequences for actions,” Conservative Party leader Andrew Scheer, who leads Trudeau in the polls ahead of next October’s parliamentary elections, said in a statement.