Hamas has demanded the release of a prominent figure serving multiple life sentences in an Israeli jail as senior world leaders are headed to Cairo, Egypt, to try to bridge the remaining gaps between Hamas and Israel.

Both Israeli and Hamas leaders expressed an openness to President Donald Trump’s 20-point peace plan, which he unveiled last Monday, but cautioned that there are still unresolved details that would need to be hammered out. These specifics have been the reason earlier attempts have not come to fruition or lasted.