British Prime Minister Theresa May urged the leaders of Saudi Arabia, Bahrain and Qatar on Thursday to take steps to reduce tensions that have led the Arab world's biggest powers to cut ties with Qatar.
Turkey is friendly to Qatar and has sent food supplies since the sanctions were imposed. Al Udeid Air Base is home to more than 11,000 USA and coalition troops.
Kuwait's Emir Sheikh Sabah Al Ahmad Al Sabah has launched a mediation effort after Saudi Arabia, the United Arab Emirates, Bahrain and Egypt severed ties with Qatar, accusing it of sponsoring terrorism.
"It indicates that the US Department of Defense under Mattis is performing the grunt work of keeping the US-Qatari security relationship moving forward", Heras said.
In another development, two US Navy vessels arrived in the Gulf on Wednesday for a joint exercise with Qatar's fleet, according to Doha state media.
Turkish Foreign Minister Mevlut Cavusoglu is due to visit Saudi Arabia on Friday in an attempt to help solve the crisis.
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