Why did King Hussein ban political parties after the attempted coup of 1957?

King Hussein banned political parties in 1957 primarily to curb domestic unrest and secure his throne following an attempted coup in April of that year. The coup attempt, carried out by members of the National Guard—who were drawn largely from the West Bank—posed a direct threat to the Hashemite monarchy.1

In response to this challenge, the king utilized the support of loyal East Bank Bedouins to purge the legislature of Palestinian nationalists and extremists. By banning political parties and establishing a royal dictatorship, Hussein sought to consolidate his authority and neutralize the internal political opposition that had been destabilizing his regime.1