In a signing statement accompanying the $106 billion bill, Obama said he wouldn't allow the legislation to interfere with his authority as president to conduct foreign policy and negotiate with other governments.
I thought the constitutional role of the President was to enforce laws, not to avoid legislation's interference with whatever the President wants to do?
Congress is elected, the President is (technically*) not. It wouldn't make sense if an ultimately un-elected office could outrank an elected parliament.
*The President is elected by an assembly whose members are practically elected but technically sent there by state authorities based on whatever the state wants, in theory.