Doyle McManus: Trump Doctrine is simple: Abandoning Kurds in Syria, he proves that allies can't trust him
President Donald Trump betrayed an American ally this week. It wasn't the first time and it probably won't be the last.
The victims this time were the Kurds, the minority ethnic group that provided most of the ground troops for the U.S. war against the militant group Islamic State in Syria. More than 11,000 Kurds died in that campaign. The number of U.S. combat deaths reported in Syria: six.
Trump's betrayal was his failure to defend the Kurds against one of their mortal enemies:
