What two reasons did Abraham Lincoln state as his authority for issuing the proclamation?

Abraham Lincoln cited two main reasons for issuing the Emancipation Proclamation: first, he viewed it as a necessary wartime measure to weaken the Confederacy by freeing enslaved people, thereby undermining their labor force. Second, he framed it as a moral imperative to promote freedom and human rights, aligning the Union's war efforts with the principles of liberty and justice.