"I think this is a very important decision about the separation of powers, " said Carl Tobias, a constitutional law professor at Virginia's University of Richmond.

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"This decision is one of the most solid and comprehensive that we've had in this very important field, " he said.

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So, again, we believe that the reason we took the decision to join this coalition and engage in military activity is because there was an imminent threat -- and this is very important.

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This is particularly true insofar as such a decision would likely have very serious repercussions for the United States, for its most important ally in the Middle East, Israel, and for the strategic relationship between them.

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And while I will never hesitate to use force to protect the American people or our vital interests, I also promise you this -- and this is very important as we consider our next steps in Afghanistan: I will never rush the solemn decision of sending you into harm's way.

WHITEHOUSE: President Obama Addresses Servicemen and Women in Jacksonville, FL | The White House