Query: What non-Egyptian leader was concerned about Nasser's popularity outside of Egypt?
Context: Nasser subsequently slammed Hussein on Cairo radio as being "a tool of the imperialists". Relations with King Saud also became antagonistic as the latter began to fear that Nasser's increasing popularity in Saudi Arabia was a genuine threat to the royal family's survival. Despite opposition from the governments of Jordan, Saudi Arabia, Iraq, and Lebanon, Nasser maintained his prestige among their citizens and those of other Arab countries.