You think that is grasping at straws?

You fuckin statist moron!
only use words you know and don't make false assumptions, like you just did.
If you think a President of a Constitutional Republic has the authority to do that WITHOUT declaration, YES, you are a statist moron.
Why would the President of the United States need a 'declaration' to put down an insurrection.
Rebels attacked troops of the United States when they fired upon Fort Sumter.
Congress authorized the calling up of Militia and Abraham Lincoln authorized the blockading of rebellious states- after the rebels fired upon American soldiers.
He had already blocked the ports before the emergency meeting... Good try!
Blocked the ports in April. Called for the meeting in july
April 12, 1861- Rebel forces fire on American troops on Fort Sumter
U.S. Secretary of State
William Henry Seward recommended adopting the blockade shortly after the Battle of Fort Sumter in April, 1861 that marked the beginning of Civil War hostilities. Gideon Welles, the Secretary of the Navy, argued for a de facto but undeclared blockade, which would prevent foreign governments from granting the Confederacy belligerent status. President Abraham Lincoln sided with Seward and proclaimed the blockade on April 19. Lincoln extended the blockade to include North Carolina and Virginia on April 27. By July of 1861, the Union Navy had established blockades of all the major southern ports.