"Where do you think his 'no entangling alliances' rhetoric comes from?"It doesn't come from the original text of the Constitution, or from the writings and debates associated with the drafting and ratification of the Constitution, so I'm fuzzy on why it's relevant to the concept of "originalism." Why, where do you think it comes from?
"Observe good faith and justice toward all nations. Cultivate peace and harmony with all... The Nation which indulges toward another an habitual hatred or an habitual fondness is in some degree a slave. It is a slave to its animosity or to its affection, either of which is sufficient to lead it astray from its duty and its interest ... Tis our true policy to steer clear of permanent alliances, with any portion of the foreign world." - George Washington, Farewell Address, 17 Sept. 1796.
"Peace, commerce, and honest friendship with all nations - entangling alliances with none." - Thomas Jefferson, 1801 inaugural address.
But hey... what the hell did they know...