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The United States has long manipulated the USD to it's own advantage. By increasing the supply of USD it debases the USD's or aggregates being held in foreign hands, which is virtually everybody as the USD is the settlement currency for oil trades. This then is a defacto tax on foreign USD holders. If foreign currencies fall in value at the same rate as the USD through their own program of currency debasement (maintaining a USD/foreign currency equilibrium) then the United States is no longer collecting that de facto tax which is used to partially fund US military spending.

Here one can see why the Trump administration has been so adamant in wanting it's Allys to pay their fair share for their defense. The United States is no longer collecting the de facto tax via manipulating the USD.