I don't know if that particular EO is unconstitutional or not but if it is some federal judge will put the kibosh on it. Our federal judges have done a pretty good job so far and are our last defense against Trump's fascist authoritarianism.
The Dems must retake the majority of the House & the Senate in the midterms & impeach Trump. If they don't & he remains in office for the full four years, America is doomed.