What resolution declares that the president can send troops into action only by authorization of Congress?

The War Powers Resolution, enacted in 1973, was designed to clarify and limit the president's ability to deploy U.S. military forces without congressional approval. It asserts that the president can only send troops into action abroad with prior authorization from Congress or if there is an immediate threat to the United States. This legislation was a response to concerns about the executive branch's overreach during the Vietnam War, where military action was undertaken without clear congressional consent.

The intention behind the War Powers Resolution is to ensure that the decision to engage in military conflict reflects a broader consensus, which involves both the legislative and executive branches. This resolution emphasizes the importance of Congress's constitutional power to declare war and aims to uphold that balance of power in matters of military engagement.

The other choices revolve around different aspects of presidential powers or legal concepts, such as the pardon privilege, which allows the president to grant pardons for federal offenses, and executive privilege, which pertains to the president's right to withhold information from Congress. The take care clause refers to the president's responsibility to ensure that laws are faithfully executed, which does not directly address the issue of troop deployment.