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emergency broadcasting system

Updated on Wednesday at 4:15 p.m. ET

Wednesday afternoon, at exactly 2:18 p.m. ET, million of Americans received a text headlined "Presidential Alert" on their cellphones.

But it wasn't exactly from President Trump. Rather, it was a test of a new nationwide warning system that a president could use in case of an armed attack by another country, a cyberattack or a widespread natural disaster.