However, Melania and Ivanka are not the only women, who did not cover their hair upon arrival in the conservative Islamic kingdom, as former USA state secretary Hillary Clinton, former first lady Laura Bush, British Prime Minister Theresa May and German Chancellor Angela Merkel had also not covered their hair in Saudi Arabia.
"Terrorism has spread all across the world".
Trump's first stop was a meeting in Jerusalem with Israeli President Reuven Rivlin. Drive them out! Drive them out of your places of worship!
Urging countries to deny terrorists space to operate, Trump said, "The first task in this joint effort is for your nations to deny all territory to the foot soldiers of evil.Every country in the region has an absolute duty to ensure that terrorists find no sanctuary on their soil".
Donald Trump and King Salman bin Abdulaziz, along with other leaders such as Egyptian President Abdel Fattah al Sisi, visited the modern establishment, where dozens of experts monitor digital communications, as shown by Saudi state television.
Trump made no mention of the disputed travel ban, signed days after he took office, that temporarily banned immigration to the US from seven majority Muslim countries: Iraq, Iran, Syria, Sudan, Libya, Somalia, and Yemen.
A centerpiece of Trump's visit to Saudi Arabia is to curb any threats to the region posed by Iran, US Secretary of State Rex Tillerson said.
Introducing Trump, Saudi King Salman described Teheran as a mutual foe and a source of terrorism they must confront together.
On Saturday the United States and Saudi Arabia announced an arms deal worth almost $110 billion (98 billion euros), which was described as the largest in U.S. history.
"Our responsibility before God and our people and the whole world is to stand united to fight the forces of evil and extremism wherever they are [.] The Iranian regime represents the tip of the spear of global terrorism", the king said.
Citing the oil-rich nation's extensive record of human rights abuses, its all-powerful royal family's grip on the nation's finances and its abuse of women - who are forced to cover their faces, not allowed to drive and who must ask a male relative for permission to travel - Applebaum took Trump and his advisers to task on a number of points.
Some 35 heads of state and government from Muslim-majority countries were in Riyadh for the Arab Islamic American Summit, mainly from Sunni states friendly to Saudi Arabia.
Soon after Trump embarked on his trip on Friday, he was hit with more accusations that, with Comey's firing on May 9, he was trying to squelch a federal investigation into his campaign's ties with Russian Federation a year ago.
"We thought it was a fantastic idea, but we had no idea how quickly this would build", Kim said.
The Saudis' warm embrace was a welcome change for the besieged White House. Trump had promised to scrap it.