It’s not just Hagee.
Even closer to McCain is Televangelist Rod Parsley, who believes that America was founded with the purpose of destroying Islam.
It appears he knows nothing of the Treaty of Tripoli.
Art. 11. As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquillity, of Mussulmen; and, as the said States never entered into any war, or act of hostility against any Mahometan nation, it is declared by the parties, that no pretext arising from religious opinions, shall ever produce an interruption of the harmony existing between the two countries.
But bigots tend to believe whatever they want to believe.
Bigotry is, after all the Republican party has these days.