The sudden move by a coalition of Arab states, led by Saudi Arabia, in early June to cut ties with and blockade Qatar perplexed US military officials and policymakers.

The Saudi-led coalition has made a series of demands of Doha for dropping the blockade, to which Qatar has shown no sign of assenting.

The spike in tension concerns US officials because of the massive Al Udeid military base in Qatar, where some 11,000 US personnel are stationed and from which US Central Command has run much of the war against ISIS in Syria, Iraq, and Afghanistan.

According to President Donald Trump, who has publicly backed the Saudi-led effort and criticized Qatar, relocating from Al Udeid would be no significant obstacle.