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The anti-federalist felt that the constitution would give too much power to the federal government. They basically were opposed because of what was in it or what wasn't in it because of fear that their civil liberties would be stripped off due to everyone functioning off of the constitution. They more so wanted a bill of rights to proclaim all the liberties a citizen is granted to avoid this.
Security loyalty to the federal government
Article II, Section 2 of the Constitution declares that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur." But it doesn't say anything about the power to break treaties.