One issue is to which President or Congress a particular year's deficit should be attributed. U.S. Congressional terms start on Jan. 1, Presidential terms later in January, and the fiscal year on Oct. 1, so none of them exactly match up.
These nephridia, which are called protonephridia, are branched tubules of ectodermal origin. They are closed at the internal ends by terminal cells, or solenocytes, and open to the exterior by means of excretory pores, or nephridiopores.
For instance, fresh-water amoebas of the heteroloboseans genus Naegleria, which is a particular biological grouping, can enter the human body and cause a fatal neurodegenerative disease of the nervous system, destroying brain tissue and almost always killing the target in less than a week.