There is yet another crisis in the middle east. This week, Saudi Arabia and its close allies in the region moved against Qatar, cutting off sea and air travel and moving to isolate their fellow sunni Gulf country.

Like Saudi Arabia and the United Arab Emirates, Qatar is a member of the Gulf Cooperation Council, a regional group of erstwhile allies that coordinate security policies against Iran and other common threats. But tensions have been brewing for many years between Qatar and other countries on the Arabian Peninsula and these tensions have apparently come to a head in the wake of Donald Trump's visit to Saudi Arabia. Qatar is home to both Al Jazeera and the region's largest US military airbase -- which is currently the strategic nerve center of the US air campaign against ISIS. This fact did not apparently stop President Trump for issuing statements, on Twitter of course, in support of Saudi allegations that Qatar is a nemesis that supports terrorist groups. On the line with me to unpack this situation and explain the roots of these regional rivalries, which has much to do with both the Al Jazeera television station and Qatar's backing of different proxies during the aftermath of Egypt's Arab Spring is Marc Lynch. Marc has been on the show before, most recently to discus his newest book The New Arab Wars, Uprisings and Anarchy in the Middle East. He is a professor at George Washington University and someone I rely on to help me make sense of tangled middle eastern politics. You can--and should follow him on Twitter at @AbuAardvark. If you have 20 minutes and want to learn about why this spat between Qatar and its neighbors is so profoundly consequential to global politics, then have a listen. Leave a review on iTunes!

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The Republic of China moves its capital from Nanjing to Taipei City, Taiwan - December 8th, 1949