The U.S. expects substantial progress in talks with Ukraine this week and hopes that a deal on critical minerals can be signed, President Donald Trump's Middle East envoy Steve Witkoff said on Monday.

Steve Witkoff, the White House's special envoy for the Middle East, said on Monday that he hopes a resources agreement with Ukraine will be reached this week. He added that he expects good outcomes from Tuesday’s talks with the Kyiv delegation in Saudi Arabia.

After a heated meeting in the White House, both sides have signaled that they are still open to reaching an agreement.

On the benefits side, the gains may not be that great. There are a lot of unknowns about Ukrainian minerals. The U.N. says Ukraine holds 5% of the world’s rare earth minerals, including 22 of the 34 most critical for national security. But assessments of Ukrainian minerals are based on outdated Soviet-era data and models that may not be accurate.

Trump has told his advisers that he wants to announce the agreement in his address to Congress tonight, sources say, cautioning that the deal had yet to be signed and the situation could change.

NBC News Senior National Security Correspondent Courtney Kube reports that President Trump wants to see more than a rare earth minerals deal to resume military aid and intelligence sharing with Ukraine,