“I support Trump issuing an Executive Order ending birthright citizenship.”
He can’t if jus solis is the law of the land as you erroneously claim.
But there is no law making children born to foreign nationals(legal or illegal) on U.S. soil citizens at birth
The only reason to challenge it is to get it into the courts to determine the constitutionality of the existing law. Trump can do it thru an Executive Order or Congress can do it by passing a bill signed by the President. Only then will we know if we need a Constitutional amendment.
Yes, US Code provides the basis for birthright citizenship. It has been done millions of times. If you have a US birth certificate, you can get a passport, vote, etc. There are two ways to obtain citizenship, at birth or thru naturalization.