This is how the Constitution reads (from Article II, Section 1):
I do solemnly swear (or affirm) that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect, and defend the Constitution of the United States.
I guess adverb placement does not matter among those whose job it is to interpret that document. Language junkies might disagree. After all, there was a poet at the ceremony.