He voted in favor of free trade with Oman to try and help U.S. relations in the Middle East. If we are going to keep troops in the region, it would be nice to have as many “friends” as possible.
Also, I’m sure the environment in Oman are such that businesses save billions in manpower simply by relocating there.
It makes no sense to support a FTA with Oman because it improves relations with an ally and then not support a FTA with, say, Costa Rica (another ally) because it will “cost jobs.”