A U.S. Supreme Court decision Monday establishing a legal standard for presidential immunity could further slow down Georgia’s 2020 presidential election interference case, several legal experts predict. The nation’s highest court ruling Monday shields U.S. presidents from criminal prosecution while engaging in “official” conduct related to their “core constitutional” presidential acts and removes immunity if the conduct is unrelated to their “unofficial” responsibilities. The ruling is in response to a federal election interference case brought by the U.S. Department of Justice against Trump,…