When US President Joe Biden delivers his State of the Union address on Tuesday evening, he'll speak in front of nearly every influential federal official in Washington - including members of Congress, top military brass, US Supreme Court justices and senior officials within his administration.But at least one top official is not expected to be in the US Capitol building for Biden's speech, participating instead in an obscure ritual in order to maintain the line of presidential succession in the rare case that disaster strikes. That person is the designated survivor.
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