There isn’t really a “martial law” in the United States, but there are ways to limit civil liberties, constitutional experts say.

South Korean lawmakers began impeachment proceedings against President Yoon Suk Yeol after he briefly imposed martial law and then reversed course on that decision just hours later. Yoon claimed martial law was necessary to protect the country from "North Korea's communist forces" and to "eliminate anti-state elements.

South Korea’s National Assembly voted to lift an emergency declaration of martial law just hours after President Yoon Suk Yeol announced it on Tuesday, in a swift rebuke of the president’s response to the political deadlock that has hobbled his tenure.