The caller would be arrested for threatening the president

Call the white house, and say the same thing about Biden, and you shall have your answer.

mr putin sir your fired

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On a serious note: You can’t. There phone in his office is on entirely separate phone network. Even if you somehow managed to splice into it, they use custom encryption that you’d need a special device to use with, but the manufacturers won’t even sell them to normal people. And that’s how they found one of the Putin’s yachts