The U.S. and Saudi Arabia are expected to sign a deal for U.S. companies to run nuclear power for the Saudis, potentially allowing the Saudis to enrich their own fuel for nuclear reactors.

The agreement gives American companies priority access to nuclear reactors and fuel to Saudi Arabia. It's expected to last decades and be worth billions of dollars.

The deal is expected to be a financial windfall for American companies but is likely to raise concerns of nuclear proliferation in the Middle East.