1. Does the president have inherent powers under the Constitution to conduct surveillance for national security purposes without judicial warrants, regardless of federal statutes?

The Supreme Court has never held that the president has such powers. As president, I will follow existing law, and when it comes to U.S. citizens and residents, I will only authorize surveillance for national security purposes consistent with FISA and other federal statutes.

2. In what circumstances, if any, would the president have constitutional authority to bomb Iran without seeking a use-of-force authorization from Congress? (Specifically, what about the strategic bombing of suspected nuclear sites -- a situation that does not involve stopping an IMMINENT threat?)

The President does not have power under the Constitution to unilaterally authorize a military attack in a situation that does not involve stopping an actual or imminent threat to the nation.

As Commander-in-Chief, the President does have a duty to protect and defend the United States. In instances of self-defense, the President would be within his constitutional authority to act before advising Congress or seeking its consent. History has shown us time and again, however, that military action is most successful when it is authorized and supported by the Legislative branch. It is always preferable to have the informed consent of Congress prior to any military action.

As for the specific question about bombing suspected nuclear sites, I recently introduced S.J. Res. 23, which states in part that any offensive military action taken by the United States against Iran must be explicitly authorized by Congress. The recent NIE tells us that Iran in 2003 halted its effort to design a nuclear weapon. While this does not mean that Iran is no longer a threat to the United States or its allies, it does give us time to conduct aggressive and principled personal diplomacy aimed at preventing Iran from developing nuclear weapons.

3. Does the Constitution empower the president to disregard a congressional statute limiting the deployment of troops -- either by capping the number of troops that may be deployed to a particular country or by setting minimum home-stays between deployments? In other words, is that level of deployment management beyond the constitutional power of Congress to regulate?

No, the President does not have that power. To date, several Congresses have imposed limitations on the number of US troops deployed in a given situation. As President, I will not assert a constitutional authority to deploy troops in a manner contrary to an express limit imposed by Congress and adopted into law.

4. Under what circumstances, if any, would you sign a bill into law but also issue a signing statement reserving a constitutional right to bypass the law?

Signing statements have been used by presidents of both parties, dating back to Andrew Jackson. While it is legitimate for a president to issue a signing statement to clarify his understanding of ambiguous provisions of statutes and to explain his view of how he intends to faithfully execute the law, it is a clear abuse of power to use such statements as a license to evade laws that the president does not like or as an end-run around provisions designed to foster accountability.