...that if a president think parts of a bill are unconsitutional, he shouldn't veto it.
Instead, the president should sign the bill and then write a signing statement about the supposedly unconsitutional parts of the bill.
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http://www.washingtonpost.com/wp-dyn/content/article/2008/02/24/AR2008022401995.html"The problem with this administration is that it has attached signing statements to legislation in an effort to change the meaning of the legislation, to avoid enforcing certain provisions of the legislation that the President does not like, and to raise implausible or dubious constitutional objections to the legislation," Obama answered. But, he added: "No one doubts that it is appropriate to use signing statements to protect a president's constitutional prerogatives."
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I "doubt" that presidents should sign bills they consider unconstitutional.