In Washington, there are differing opinions about Qatar. But this gas-wealthy country, which is home to the largest American military presence in the Middle East, is probably the US’s closest ally in the Gulf. Over the years, Washington has worked with Doha in relation to many hotspots, including Afghanistan, Gaza, Iraq, Libya, Syria, and Yemen. Across many domains, including counterterrorism, investment, trade, economics, diplomacy, culture, education, and health, the US-Qatar relationship is deep and multifaceted. With unique diplomatic capabilities, Qatar has helped Washington deal with man…