The statement has been made that the Prophet [Joseph Smith] said the time would come when this Constitution would hang as by a thread, and this is true. There has been some confusion, however, as to just what he said following this. I think that Elder Orson Hyde has given us a correct interpretation wherein he says that the Prophet said the Constitution would be in danger. Said Orson Hyde:

I believe he said something like this—that the time would come when the Constitution and the country would be in danger of an overthrow; and said he: ‘If the Constitution be saved at all, it will be by the Elders of this Church.’ I believe this is about the language, as nearly as I can recollect it (JD 6:152).

Now I tell you it is time the people of the United States were waking up with the understanding that if they don’t save the Constitution from the dangers that threaten it, we will have a change of government.

( Source: “Founded in the Wisdom of God” 416 )