Canada's new Prime Minister Mark Carney has asked Defense Minister Bill Blair to review the purchase of America’s F-35 fighter jet to see if there are other options “given the changing environment," a spokesman for Blair said Saturday.

Carney, a former Goldman Sachs executive with no experience in politics, becomes Canada's 24th prime minister.

The former central bank chief takes over at what he has called “a time of great peril” for Canada, with Trump attacking its sovereignty and economic security.

Former central banker Mark Carney was sworn in as Canada’s new prime minister on Friday, and will now try to steer his country through a trade war brought by U.S.

But, at the same time, no option is off the table—including restrictions on energy and natural resources. Because of the highly-linked energy systems of the two countries, such a move could wreak significant havoc on the U.