“The United States’ connection with the children of illegal aliens and temporary visitors is weaker than its connection with members of Indian tribes. If the latter link is insufficient for birthright citizenship, the former certainly is,” the Trump administration argued.

Everything they are saying about Native Americans is to support their argument against immigrants.

The United States’ connection with the children of illegal aliens and temporary visitors is weak…

I don’t accept this. The people who are not “subject to the jurisdiction” are agents of, or in the service of foreign governments. Like diplomats, spies, or soldiers in an invading army. People following the orders of foreign governments. People paid by foreign governments to be in the US. The US connection to the children of these foreign agents is weaker than the US connection to Native American tribes. The children of these agents don’t have a claim to citizenship under the 14th amendment.

BUt Private individuals who choose to come to the US are not acting under orders from a foreign government. They come here - legally or illegally - under their own volition. In doing so, they directly subject themselves to US law, which means that their children born in the US fall under the 14th Amendment.