"There are growing signs of a potentially destabilising rift between the king of Saudi Arabia and his heir"

Guardian:

The unease is said to have been building since the murder in Turkey of the dissident Saudi journalist Jamal Khashoggi, which the CIA has reportedly concluded was ordered by Prince Mohammed. However, these tensions increased dramatically in late February when the king, 83, visited Egypt and was warned by his advisers he was at risk of a potential move against him, according to a detailed account from a source.

His entourage was so alarmed at the possible threat to his authority that a new security team, comprised of more than 30 hand-picked loyalists from the interior ministry, was flown to Egypt to replace the existing team.