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His phone probably is secure, and only a redundant container of data stored elsewhere. I'm fairly certain that everything the president does is saved and archived for various reasons.

The security is anti non authorized access. That's all he wants for everyone else too. A warrant says that the government has access to the data in the device. Its a system we've had in the constitution since the beginning. I'm really baffled at why people oppose this on an ideological basis. On a practical basis, I understand the argument that once there is a way for the government to gain access, that could open up access for everyone else as well. But thats the only argument that makes sense.