(CBS Local) — For the first time, every American will get a text from President Trump tomorrow. It’s only a test — but you can’t opt out.

President Donald Trump will text every cell phone in the U.S. at 1:18 p.m. (CST) on Wednesday to test a national presidential alert system that will let any president issue a warning about a crisis.

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“When those messages appear on mobile devices, people should take those extremely seriously,” FEMA’s Antwane Johnson told CBS News. “It has some direct impact on either life or safety.”

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Johnson said the system will be used to notify U.S. citizens of certain events of “national significance.”

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The new presidential alert will be used for advance warning of national crises, and not for regional or local alerts.