The Guardian reports: A US trade adviser appointed by Barack Obama orchestrated a deal to buy gold worth millions of dollars from a wanted Congolese warlord, according to a UN report.

Kase Lawal, a Nigerian-born US oil tycoon, transferred millions of dollars to the notorious rebel leader Bosco Ntaganda between December 2010 and February 2011 as part of the deal, the report by the UN’s Group of Experts on the Democratic Republic of the Congo (DRC) states.

If true, this would be a contravention of UN resolutions banning individuals or organisations from financing illegal armed groups in the wartorn eastern DRC.

The UN report says Lawal, the chairman and chief executive of the Houston-based oil firm Camac, was aware he was paying Ntaganda.

Obama put Lawal on the US advisory committee for trade and policy negotiations in September 2010, just months before the deal with Ntaganda.

All efforts to reach Lawal failed. Camac said it had no comment on the allegations, but said: “Camac is a law-abiding company and we disagree with the representations made in the report.” The White House did not respond to a request for comment.