"[U]ndermines core U.S. interests,": such as endless wars to steal other sovereign nation's resources and turning these countries to rubble so corporations can go in and "rebuild" for profit? Such as keeping the war manufacturing--essentially the only real manufacturing base in the US--humming?
"The whole notion of sovereign immunity is at stake.": of course The US is not really bothered by this little thing called "sovereignty", the need for nations to be immune to unnecessary attacks, to protect and control their own resources.
"It will deter terrorism and hold accountable those nations that support and fund it": Shouldn't this begin with the USA whose global interference, especially in the Middle East, is supporting the recruitment of militants?