This article is being co-published with DeSmog, a climate investigations website. Click here to get DeSmog’s free newsletter.

President Donald Trump’s U.K. ambassador holds shares worth hundreds of millions in the key sectors that stand to benefit from last week’s U.K.-U.S. trade agreement.

Stephens played a key role in pushing through the deal, according to the United Kingdom’s ambassador to the U.S., Peter Mandelson, and campaigners have raised concerns that he will personally benefit.

According to financial records viewed by DeSmog and The Lever, Warren Stephens’ family-owned investment company, Stephens Inc., owns stocks worth at least $250 million in agriculture and food firms — the principal beneficiaries of the deal announced by the United States and the U.K. on May 8.

The trade agreement, which allows the U.S. agriculture sector to trade more easily in the U.K., “will create a $5 billion opportunity for new exports for U.S. farmers, ranchers, and producers,” according to the Trump administration.