The prime minister will not say whether Canada plans to follow its allies in removing economic sanctions against Iran, while the interim Conservative leader warns that doing so could hurt the Canadian economy.

Prime Minister Justin Trudeau left a press conference Monday before answering a question from a reporter about whether he would lift Canada’s sanctions.

Trudeau did, however, respond to another Iran-related question earlier at the press conference, in Saint Andrews, N.B., about whether Canada would reopen its embassy in Tehran.

“Iran’s significant movement toward respecting international expectations are a very positive sign and a victory for quiet diplomacy everywhere,” Trudeau said. “Global Affairs Canada is engaged with the issue and I look forward to discussing this at a future cabinet meeting.”

Foreign Affairs Minister Stephane Dion later told reporters cabinet will soon decide whether to lift sanctions, adding that a decision will be made quickly so that Canadian companies are not disadvantaged now that European and U.S. businesses can trade more with Iran.

Interim Conservative leader Rona Ambrose, meanwhile, urged the Trudeau government to be cautious in its approach to Iran.

“I think we should still be very suspicious about what their intentions are with their nuclear program and really the onus is on them … to prove to the world that they’re a trustworthy partner,” Ambrose told reporters after a speech in Toronto.

“The other issue about taking sanctions away is,” she added, “once those sanctions are removed, Iran is going to flood the market with cheap oil which has a huge effect on the Canadian economy.”

The U.S. and European Union lifted some oil-related sanctions over the weekend that were put in place in 2012 to pressure Iran to allow inspections of its nuclear program.

Iran’s deputy oil minister said Monday that it plans to increase output by 500,000 barrels per day, and eventually return to pre-sanctions production levels.

A briefing note prepared for the prime minister and obtained by The Canadian Press said Canada could lift sanctions “as early as winter 2016 and as late as summer 2016.”

Another briefing note obtained by CP said bureaucrats were finding it difficult to deal with sanctions, due to the fact that the number of countries facing them had jumped substantially in recent years.

With files from The Associated Press and The Canadian Press