The Hashemite Kingdom of Jordan has traditionally been in the 'western' camp. It is politically attached to the United Kingdom and the United States as well as to Saudi Arabia and other Sunni majority Gulf states. The Jordanian King Abdullah II has in the past been hostile to Iran. He was to first to publicly stoke fear of a 'Shia crescent'. But the new Saudi and U.S. plans for 'peace' with Israel are a threat to Jordan and to King Abdullah's personal legitimacy. He needs to change his position. Provided with the right incentives Jordan could, eventually, join the 'resistance' side with Iran, Syria and Hizbullah.
The country ruled by King Abdullah has nearly ten million inhabitants but is relatively poor. It has few natural resources. The generally well educated population attracted some foreign investment in its industry. Many Jordanians work abroad and send remittances. But all that is not enough. The country needs foreign subsidies to keep its standard of living.
The King of Saudi Arabia derives legitimacy from his title as "Custodian of the Two Holy Mosques" in Mecca and Medina. The King of Jordan springs from the thousand year old great Hashemite dynasty. He heads the Jerusalem Islamic Waqf (Foundation) and is the custodian of the Islamic holy sites in Jerusalem, the Al-Aqsa mosque and the Dome of the Rock. This responsibility is the only prominent function left for the Hashemite family. It is the source of King Abdullah's legitimacy.
The changes in Saudi Arabia's policy towards Israel and the Zionist 'peace plan' the Trump administration develops create a new situation for Jordan. It is put under immense economic pressure to agree to these plans.
Jordan took part in the war on Syria. While Turkey provided support for the "rebels" attacking Syria from the north Jordan played a similar role in the south. Weapon and ammunition supplies from Saudi Arabia and Qatar were shipped through Jordan and smuggled into Syria. The country welcomed the families of the 'rebels' as refugees and provided medical support. The "southern operation room" of the 'rebels', run by the CIA, was hosted in Jordan's capital Amman.