Which is one example of a president expanding the excecutive powers outlined in the constitution?

One notable example of a president expanding executive powers is Abraham Lincoln during the Civil War. Faced with the secession of Southern states and the national crisis, Lincoln took several actions that stretched the limits of executive authority, such as issuing the Emancipation Proclamation and unilaterally suspending habeas corpus. These actions were justified by Lincoln as necessary for preserving the Union, but they sparked significant debate about the balance of power between the branches of government. This period marked a pivotal moment in the interpretation of presidential powers within the U.S. Constitution.