P.M. Edition for Dec. 9. Police have arrested a 26-year-old man in Pennsylvania on firearms charges tied to last week’s killing of UnitedHealthcare CEO Brian Thompson. And as the U.S. scrambles to meet Syria’s new political reality, WSJ national security correspondent Michael Gordon talks us through the options. Plus, Americans are driving older cars, but they are also deferring their maintenance, says WSJ global editor of Heard on the Street Spencer Jakab. Alex Ossola hosts.

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