Opposition to a deal that would allow U.S. companies access to critical minerals in Congo is growing after Congo's President Felix Tshisekedi returned from the U.S. minerals summit last week — with praises from U.S. President Donald Trump and U.S. lawmakers.

Tshisekedi has offered U.S. companies access to eastern Congo's rich minerals — mostly untapped and estimated to be worth $24 trillion – as a bargaining chip for U.S. support to help fight off rebels and build critical infrastructure in the region where Rwanda-backed rebels seized major cities last year.