I don't quite agree. There is no point in attempting impeachment over executive orders (or just about anything else with the corrupt democrats holding 45 seats in the Senate). Impeachment will fail, and failures are rarely useful. Congress should pass such narrow and parsimonious spending bills that there is no money that can be lawfully used on this unlawful power grab or on any other unilateral executive actions. We need to starve the Beast - stop feeding portions of FedGov that are not specifically authorized under the Enumerated Powers.
You can’t defund amnesty. This is going to permanatly change the demographics of the country. It’s ball game.