Certainly not everything, but I strongly suspect they're aware of the major points. ....which includes the massive increase in legal immigration, of course. Kennedy has a long history of supporting such legislation (see post #5).
No doubt. To me, the major increase in legal immigration was far more important than what would happen to the illegals already here.
The truth of the matter is that neither one wrote the legislation, so they probably do not know the specifics of the bill. Or didn't, until Sessions & heritage exposed it. Sessions is an oddity ( a good one) in that he actually researches the bill and has his staff do so as well. Perhaps because he's one of the few capable of understanding it given his history in law.
Most of these Senators contract out the work of the written legislation to their staffs at very least, or outside lobby groups. They may not know what is in the legislation at first, but I'll guarentee they know the people they contract the legislation out to. They know their agenda, and they support that agenda.
"Every Person born within the limits of the United States, and subject to their jurisdiction, is by virtue of natural law and national law a citizen of the United States. This will not, of course, include persons born in the United States who are foreigners, aliens, who belong to the families of ambassadors or foreign ministers accredited to the Government of the United States, but will include every other class of persons.
Senator Jacob Howard, Co-author of the citizenship clause of the 14th Amendment, 1866.