A rare thing: a Democrat with integrity:

It is a great honor to represent the House of Representatives. We are prepared to litigate this matter as far as necessary. The question presented by this lawsuit is whether we will live in a system of shared and equal powers, as required by our Constitution, or whether we will continue to see the rise of a dominant Executive with sweeping unilateral powers. That is a question worthy of review and resolution in our federal courts.

Indeed.