Declare..

 
The most direct power Congress has is the power to declare war. The principle behind this is that no one person should put the burden of war on the entire country, and such a choice should instead require the masses’ approval. 

As U.S. Supreme Court Justice Joseph Story wrote in 1838, “[I]t should therefore be difficult in a republic to declare war; but not to make peace.” This is why the Constitution grants Congress the power to declare war and not the president.

There have been multiple wars over the last eight decades without a declaration of war from Congress.

In some cases, Congress gave a different form of authorization, or the president moved forward with military action without congressional approval. 

In response, Congress passed the “War Powers Resolution,” which modernized the declaration of war power and proscribed rules for when the president can use the military to engage in combat. 

The congress gave up their responsibilities to follow up on major issues in the country, like failed impeachments, ... The responsibilities fell in the hands or picked up by some.....       Just a thought.