Which branch declares laws of constitutional?
In the United States, once a proposed law called a bill, is sent
to the US President from the US Congress, it can be said that a new
law has been created. It is now the job of the executive branch,
under the president to enforce the law and of course in any major
legislation, there might be an announcement made in a press
conference by the president's press secretary or by a press
conference held by a member of Congress.