Given that much of what Obama did regarding immigration was by Executive Order and not enforcing the law, that can easily be undone by the Trump Administration and there is little to nothing a junior senator in the minority party can do about it.
It’s a form of national insanity which is prevalent and growing that there are now millions of citizens who believe that violation of the law is perfectly okay - as long as it’s done by Mexicans.
This is the one the demoRats are “grooming” to run for President. She is very ambitious as well.
Trump's biggest obstacles are illegal friendly republicans joinining democrats to limit funding to agencies that will enforce the law, and immigration courts.