No, illegal means that one is breaking the law.
Unconstitutional means that a law is not in compliance with the constitution. That does not mean that anyone will be charged with criminal activities. It usually means that a law is no longer valid and anyone charged under that law will not be prosecuted and any conviction will be overturned.
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Something that is not permitted by the constitution is unconstitutional and illegal.
is it unconstitutional
Tenure of Office Act of 1867 made it illegal for the President to fire a cabinet member without the approval of Congress. It was used as grounds for impeaching President Andrew Johnson. It was later declared to be unconstitutional.
by allowing unconstitutional laws to be challenged and overturned
The Judicial branch declares acts or actions to be unconstitutional.