This is way beyond criminal. This is an act of war against Mexico, which so far as I know, is still a sovereign nation, even though it is undergoing internal strife.
When one nation makes a policy of supporting rebels or even terrorists in another country, this is regarded as very bad relations. As a parallel situation, say, Iran or another nation known to support terrorists against their enemies, like supplying arms and rockets to Hamas, to be used against Israel, that is provocative action that could only be called war-like.
In this era of undeclared and irregular wars, the intent of making weapons available to known terrorists is in itself an act of terror, and in a larger sense, yet another undeclared but active war.
There is an awful lot of “walking” that is going to have be done here. Like maybe a “perp walk” for a number of as yet unindicted co-conspirators.
That would darned near clear out the Department of Justice.
It could also be called state-sponsored terrorism.
That is what our State Dept. calls it when Iran, NK and other nations do it.