When Grand Juries have concluded that an official indictment is warranted, that's more than mere accusations. And "innocent until proven guilty" is not a legal construct; it's simply a moral standard (or verbatim reminder of local judges to their local jurors when considering information in hopes of limiting their prejudice on information demonstrated during trial).
The US Constitution, which outlines many aspects including what the three branches of government are, also outlines disqualifiers for consideration.
You cannot just cherry-pick which few words you like and discard everything else! It's an all-or-nothing thing (as stipulated by the Founding Fathers/signatories and the croonies who've adulterated its intentions/meanings over the years).