That would allow him to access the money to build a wall or barrier without the approval of Congress even though Congress has the Constitutional control over how the government spends public money.
In a 5-4 ruling, the Supreme Court decided the law was too vague to be constitutional because Congress didn't define what exactly would qualify as a violent crime.
The White House says that the nation should focus on getting weapons away from dangerous people but not on, quote, blocking all Americans from their constitutional rights.
In over 200 years of constitutional history, Americans have learned much about the way in which the system can be managed so as to make possible the peaceful transfer of power from one party to the other.