as unusual thigh bone fractures have occurred. speak to your doctor before stopping prolia® as spine and other bone fractures have occurred. prolia® can cause serious side effects, like low blood calcium; serious infections which could need hospitalization; skin problems; and severe bone joint, or muscle pain. are you ready? ask your doctor how prolia® can help strengthen your bones. breaking overnight at this hour, the united states is pulling troops from northern syria. essentially abandoning kurdish fighters who fought alongside the u.s. to defeat isis. joining us now is nicolas burns, former ambassador to nato. we should also note that mr. burns is also a policy adviser to joe biden's 2020 campaign. thank you so much for joining us. >> thank you. >> let me begin by getting your reaction to this developing news overnight that the u.s. is