Since the outbreak of the crisis, King Mohammed VI maintained "close and continuous contact with different parties", and called on all parties to show restraint and wisdom in order to defuse tension and overcome the crisis with a view to "finding a lasting settlement to the causes that have led to the current situation in line with the spirit that has always characterized the GCC".
Qatar denies their accusations that it supports Islamist militants and Shi'ite Iran, arch regional foe of the Sunni Gulf Arab monarchies. "The time has come to call on Qatar to end its funding", Trump said last week.
Shell Smith was appointed ambassador to Qatar by ex-President Barack Obama in 2014.
"We wish her the best as she moves on from the Department of State".
Soon after FBI Director James Comey was sacked, Smith tweeted: "Increasingly hard to wake up overseas to news from home, knowing I will spend today explaining our democracy and institutions".
In Washington, Saudi Arabia's foreign minister insisted there's no blockade on Qatar and said his country will provide food and medical aid if needed.
Saudi Arabia also closed its land border with the tiny Gulf nation, cutting it off from its sole land crossing.
Last week, Secretary of State Rex Tillerson urged the Saudi alliance to ease "the blockade against Qatar".
On Monday, Qatar denounced the sanctions imposed against Doha by Saudi Arabia and its allies as "unfair" and "illegal", as Britain announced talks to try to resolve the crisis.
"We're ready to discuss any requests that are made, but we have not received any reply", the broadcaster quoted Sheikh Mohammed bin Abdulrahman al-Thani as saying.
The authority said that it is fully committed to the provisions of the Convention on International Civil Aviation (the Chicago Convention of 1944) and other conventions to ensure the safety of international civil aviation and the flow of international air traffic over the airspace of the country.
Meanwhile, the ambassadors of Saudi Arabia, UAE and the Bahraini Embassy's charge d'affaires in Turkey met in Ankara on Monday with Turkish Minister of Foreign Affairs Mevlut Cavusoglu.
The following day, Morocco sent a number of planes bearing humanitarian aid - including food - to embattled Qatar.