

This lawsuit is on a really narrow ground: the law says that when the president calls up a state guard into federal service, the orders must issue through the state governor.
In this case, the President wrote the words “Through: The Governor of California” at the top of the memos. But he never actually sent anything to Gavin Newsom, or gave California any formal notice at all.
This suit also doesn’t challenge the active duty marines, which are indisputably under Trump’s chain of command. But they can’t do domestic law enforcement unless the Insurrection Act is invoked (it hasn’t, formally).
If you want top speed, Fortran is faster than C.