Asaad bin Tariq Al Said (L), Oman’s Deputy Prime Minister for International Relations and Affairs, is welcomed during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331DR

Lebanon's Prime Minister Saad al-Hariri arrives at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331ZM

Jordan's King Abdullah II welcomes Lebanon's President Michel Aoun during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX3321K

Asaad bin Tariq Al Said, Oman’s Deputy Prime Minister for International Relations and Affairs (L) is welcomed upon his arrival at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331ED

Jordan's King Abdullah II stands next to Egypt's President Abdel Fattah al-Sisi during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332L9

Jordan's King Abdullah II stands next to Prime Minister and Vice-President of the United Arab Emirates and ruler of Dubai Sheikh Mohammed bin Rashid al-Maktoum during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332RI

Asaad bin Tariq Al Said, Oman?s Deputy Prime Minister for International Relations and Affairs (2ndL) is welcomed upon his arrival at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331E9

Jordan's King Abdullah II welcomes Egypt's President Abdel Fattah al-Sisi during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332L4

Lebanon's President Michel Aoun is welcomed by Jordan's King Abdullah II during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX33227

Asaad bin Tariq Al Said (L), Oman’s Deputy Prime Minister for International Relations and Affairs, is welcomed during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331F2

Jordan's King Abdullah II stands next to Egypt's President Abdel Fattah al-Sisi during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332NR

Asaad bin Tariq Al Said, Oman?s Deputy Prime Minister for International Relations and Affairs (L) is welcomed upon his arrival at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331F9

Jordan's King Abdullah II welcomes Egypt's President Abdel Fattah al-Sisi during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed

Jordan's King Abdullah II welcomes Prime Minister and Vice-President of the United Arab Emirates and ruler of Dubai Sheikh Mohammed bin Rashid al-Maktoum during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332SJ

Asaad bin Tariq Al Said, Oman’s Deputy Prime Minister for International Relations and Affairs, arrives at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX331FX

Jordan's King Abdullah II welcomes Prime Minister and Vice-President of the United Arab Emirates and ruler of Dubai Sheikh Mohammed bin Rashid al-Maktoum during a reception ceremony at the Queen Alia International Airport in Amman, Jordan March 28, 2017. REUTERS/Muhammad Hamed - RTX332QR