> Hasn't the president signed an executive order that says birthright citizenship is not for children of non-citizens?
Executive orders have force to the extent that they exert powers that the President has directly under the Constitution or that are assigned to the President by Congress exercising the powers it has directly under the Constitution.
Amending the Constitution by altering the definition of citizenship in the Fourteenth Amendment (or overruling the Supreme Court's consistent reading of the language of the Fourteenth Amendment, if you prefer that characterization) is neither a power granted to the President directly by the Constitution, nor a power Congress has granted the President by statute, nor even within the power granted to the Congress by the Constitution to grant to the President if it was inclined to do so.
> I see that it's being challenged in court, but the order is currently valid, right?
“Currently valid” is a tricky concept. In one sense, its is valid only to the extent it is actually compliant with the Constitution and laws which have higher priority than executive orders. Or you can read the question as really being about whether it can currently be applied, in which case the answer is a more simple “no”, because after the Supreme Court made the usual recent route to a simple single interim resolution pending the full litigation by simply deciding that nationwide injunctions were not within the power of district courts, they could only issue orders against government actions applicable to the litigants before them, a class action was certified covering everyone who might be affected by the order [0], and a preliminary injunction in that case has blocked the order.
Executive orders have force to the extent that they exert powers that the President has directly under the Constitution or that are assigned to the President by Congress exercising the powers it has directly under the Constitution.
Amending the Constitution by altering the definition of citizenship in the Fourteenth Amendment (or overruling the Supreme Court's consistent reading of the language of the Fourteenth Amendment, if you prefer that characterization) is neither a power granted to the President directly by the Constitution, nor a power Congress has granted the President by statute, nor even within the power granted to the Congress by the Constitution to grant to the President if it was inclined to do so.
> I see that it's being challenged in court, but the order is currently valid, right?
“Currently valid” is a tricky concept. In one sense, its is valid only to the extent it is actually compliant with the Constitution and laws which have higher priority than executive orders. Or you can read the question as really being about whether it can currently be applied, in which case the answer is a more simple “no”, because after the Supreme Court made the usual recent route to a simple single interim resolution pending the full litigation by simply deciding that nationwide injunctions were not within the power of district courts, they could only issue orders against government actions applicable to the litigants before them, a class action was certified covering everyone who might be affected by the order [0], and a preliminary injunction in that case has blocked the order.
[0] https://www.aclu.org/barbara-v-trump-nationwide-class-action...