But what’s to guarantee that this president, or a future one, will show the reticence of his predecessors? To borrow from Justice Robert Jackson’s dissent in Korematsu v. United States, the 1944 Supreme Court decision that upheld the internment of Japanese Americans, each emergency power “lies about like a loaded weapon, ready for the hand of any authority that can bring forward a plausible claim of an urgent need.”
2. AN INTERNET KILL SWITCH?
Like all emergency powers, the laws governing the conduct of war allow the president to engage in conduct that would be illegal during ordinary times. This conduct includes familiar incidents of war, such as the killing or indefinite detention of enemy soldiers. But the president can also take a host of other actions, both abroad and inside the United States.
These laws vary dramatically in content and scope. Several of them authorize the president to make decisions about the size and composition of the armed forces that are usually left to Congress. Although such measures can offer needed flexibility at crucial moments, they are subject to misuse. For instance, George W. Bush leveraged the state of emergency after 9/11 to call hundreds of thousands of reservists and members of the National Guard into active duty in Iraq, for a war that had nothing to do with the 9/11 attacks. Other powers are chilling under any circumstances: Take a moment to consider that during a declared war or national emergency, the president can unilaterally suspend the law that bars government testing of biological and chemical agents on unwitting human subjects.The president could seize control of U.S. internet traffic, impeding access to certain websites and ensuring that internet searches return pro-Trump content as the top results.>
One power poses a singular threat to democracy in the digital era. In 1942, Congress amended Section 706 of the Communications Act of 1934 to allow the president to shut down or take control of “any facility or station for wire communication” upon his proclamation “that there exists a state or threat of war involving the United States,” resurrecting a similar power Congress had briefly provided Woodrow Wilson during World War I. At the time, “wire communication” meant telephone calls or telegrams. Given the relatively modest role that electronic communications played in most Americans’ lives, the government’s assertion of this power during World War II (no president has used it since) likely created inconvenience but not havoc.
Source : https://www.theatlantic.com/magazine/archive/2019/01/presidential-emergency-powers/576418/451