I think that McConnell is pushing so hard for this is that he believes that the only way the US can possibly pull out of its current economic death-spiral is another major war.
A non-consensual maritime interdiction by US forces would be incendiary, and would be - rightly - considered an act of war by North Korea.
But let's remember something here: North Korea has a defense pact with China, and South Korea has a defense pact with the US.
Let us hope that there are some adults in the room in Washington , Pyongyang, and China who will not let things get out of control.