An opinion piece by Senator Russ Feingold on NBC says:
although it took a 1945 vote in the Senate to allow President Harry Truman to ratify the U.N. Charter, the current weight of legal opinion holds that President Donald Trump has the power to withdraw the U.S. from this or any treaty without similar consultation with the legislative branch of government.
So how many treaties have US presidents terminated without Congress approval? (That article doesn't give numbers.)
I know of some examples, e.g. Carter terminating the Taiwan defense treaty, leading to Goldwater v. Carter or Bush withdrawing from the ABM treaty, which also led to a lawsuit from some Congressmen. (Both of these challenges were dismissed, although the courts also avoided to rule on the constitutionality of the matter[s].) But are there some numbers/statistics beyond these famous cases?