Investigate in California, looking for vote fraud by illegals. Any illegal who voted in for US House, US Senate, or President, regardless of who they voted for, should be deported and permanently barred from reentry. Then, yes, revoke Dreamer and all other programs that reward criminal behavior.
Yes. In conjunction with this:
1) Pass bullet proof Voter ID laws
2) Meticulously scrub voter registration roles, and keep scrubbing them continuously
3) Demolish any existence of felony voting
4) Create a bullet proof and simple method to ensure our military personnel are never disenfranchised of their right to vote.
This should ensure conservative majorities for generations