What aspect of presidential power is examined in the courts?

The examination of presidential power in the courts primarily focuses on the scope and limits of executive power as defined by the Constitution. This means that courts often assess whether a president's actions and decisions are within the legal boundaries established by the Constitution and whether they abide by statutory law.

For instance, significant Supreme Court cases such as United States v. Nixon and Youngstown Sheet & Tube Co. v. Sawyer have explored the extent of executive privilege and presidential authority, examining how far the president can go in exercising power and where that power might be restricted. The judicial branch plays a critical role in interpreting the Constitution, thus ensuring that the balance of power among the branches of government is maintained.

In contrast, the other answer options are not directly related to how courts assess presidential power. Economic policies are typically function of the executive branch's responsibilities but do not directly pertain to constitutional questions. Similarly, approval ratings and the effectiveness of presidential speeches are measurements of public perception and communication strategy, rather than legal assessments of power.