Washington (CNN) President Donald Trump is tearing through constitutional norms again with his suggestion that he can remove the right to citizenship for children born in the United States of undocumented immigrants.

Even if this idea goes nowhere and it is likely to go nowhere -- the Constitution's 14th Amendment 150 years ago conferred automatic citizenship to anyone born in the US, and the Supreme Court has upheld that birthright - the latest assertion reinforces a singular Trump message: The law is what he says it is.

Trump has declared people innocent or guilty, based on his personal views. He has derided US judges for decisions with which he disagrees. He has swatted away fundamental notions of due process by calling for the death penalty of people before they were even formally tried in court.

Now he appears to want to rewrite the Constitution with the stroke of his pen.

His targets have often been racial minorities and immigrants. Last May, the President suggested that immigrants at the border could be summarily deported without the usual hearings to determine if they deserved asylum or were US citizens wrongly apprehended.

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