It was also announced that Secretary of State Rex Tillerson will travel to Kuwait - one of the countries angry at Qatar in the spat - on July 10 at the invitation of Kuwait to discuss the row. Mattis, who spoke with his Qatari counterpart Khaled bin Mohammed al-Attiyah by phone, discussed the status of operations against the Islamic State group.
Saudi Arabia accuses Qatar of using Twitter to stoke dissent
Qatar hosts a vital US-led command center at the Al-Udeid air base, where the anti-IS coalition launches raids against the militants. "Secretary Mattis and Minister al-Attiyah affirmed their commitment to continued US-Qatar cooperation and deepening their strategic partnership," a Pentagon readout of the conversation stated.
Saudi Arabia is leading a four-country blockade of Qatar in the region's biggest crisis in years.
Mattis stressed the importance of de-escalating tensions "so all partners in the Gulf region can focus on next steps in meeting common goals," the readout stated.
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