Here are the warnings against foreign influence given by George Washington in his farewell letter to the United States Congress in 1796.
Observe good faith and justice toward all nations; cultivate peace and harmony with all. The nation which indulges towards another a habitual hatred or a 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.
As avenues to foreign influence in innumerable ways, such attachments are particularly alarming to the truly enlightened and independent patriot. How many opportunities do they afford to tamper with domestic factions, practice the arts of seduction, mislead public opinion, influence or awe the public councils. Such an attachment of a small or weak nation towards a great and powerful nation dooms the former to be the satellite of the latter.
Wake up against the insidious wiles of foreign influence (I conjure you to believe me, fellow-citizens) the jealousy of a free people ought to be constantly awake, since history and experience prove that foreign influence is one of the most baneful foes of republican government. Excessive partiality for one foreign nation and excessive dislike of another cause those whom they actuate to see danger only on one side, and serve to veil and even second the arts of influence on the other.
Real patriots who may resist the intrigues of the favorite are liable to become suspected and odious, while its tools and dupes usurp the applause and confidence of the people, to surrender their interests.