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Bu speaking on Sunday, White House National Economic Council Director Kevin Hassett told CBS News that "those exports of critical minerals have been getting released at a rate that is, you know, higher than it was, but not as high as we believe we agreed to in Geneva".

In a brief reply, Mr Bu denied that the agency had sent abroad any children wrongly identified as orphans during his tenure.

The BBC contacted Bu Chung-ha, who in the 1970s served as chairman of Holt International, South Korea's largest adoption agency.

"It started already in the early 1990s," says Christina Bu, the secretary general of the Norwegian EV Association, as she took me for a spin around Oslo in an electric minivan.

Ms Bu says there's "not really any reason why other countries can not copy Norway".