The US State Department is A LOT more than “not all warm and fuzzy on the concept” of dual citizenship, for cripes sake!
You keep trying to make light of a very serious matter. In the case of the Executive Branch, there are NO internal safeguards.
In the Legislative branch with its two Chambers, the House has 435 members, so a few foreigners or dual citizens among them really do not make that much difference. The Senate only consists of 100 Members, so 1 or 2 out of 100 again is something else. Even the Supreme Court has nine members.
Alone, the Executive branch of our Government is vested in a single person. The Second and Third "Committee of Eleven" in summer 1787 contemplated THREE Executives, but opted for ONE Executive with the understanding that the office would have the UNIQUE safeguard of only permitting a "Natural Born Citizen" to act as the President. A few States in the Republic have had the "Natural Born Citizen" for various offices well into the 1800s, but the office of President is the ONLY office that has this qualification at the National Level per the US Constitution.
This is how it was addressed in 1990 in this English translation of a US State Department communique to the Russian embassy when the US began to acknowledge “dual citizenship” for the first time:
Official. U.S. position with regard to dual citizenship, which is guided by State Department, has been set forth in this telegram am. consulates and embassies on April 16. 1990. (67 Interpreter Releases 799, 23.07.90, 67 Interpreter Releases 1092, 01.10.90).
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At the same time, it is assumed that a person with dual citizenship are equally loyal to the United States and another State. They are required to obey the laws of both countries and each country has the right to enforce its national laws there are.
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U.S. has no treaty on mutual recognition of dual citizenship with other countries. In the late 19th and early 20th centuries, the United States ratified a number of treaties on nationality (the so-called «contract Benkrofta», on behalf of a well-known am. Diplomat J. Benkrofta), but their goal was just the prevention of cases of dual nationality by automatic deprive a person of U.S. citizenship when adopting the State of nationality of the counterparty under the contract, and vice versa. As a result, as many decisions Am. Supreme Court's dual citizenship, these contracts were not feasible, and to date the U.S. got out of all.