The Bush administration managed to get around the statutory requirement that no more than four members of the U.S. Commission on Civil Rights be members of any one political party when two sitting Republican members changed their party affiliations to "independent" just before the president appointed two more Republicans to the panel in 2004.
And yes, it is a first any Administration. He is, by the way, in charge of upholding the laws of the country. He is also making a mockery of upholding the laws of the country - which apparently offends no Republican (and yes, plenty of Democrats actually did complain loud and long about Bill). But I guess it is just another precendent that Hillary can follow with glee.