There is nothing idle about wondering if Donald Trump is a traitor. I am sure that NATO does and won’t share any important secrets with him; after all, they might go straight into ol’ Vladimir’s ear.
There is a reason that Trump consistently takes diplomatic and economic positions that undermine and isolate the United States, positions that jibe perfectly with Putin’s ambitions — and Occam’s Razor1 suggests the reason is that Trump works for Putin.
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1 The simplest explanation is usually the best.