FMP, polls are bullshit and biased. No adult I know is ever polled for the shit they show ion TV. Bet you 100 bucks the people who are agreeing with this law are conservative, white, and mostly middle class. I was in Arizona and a lot of people on the border I met didn't care about people coming across. If anything, they hated Border Patrol more that migrants.
I could care less why he's challenging it, even if it's to save his campaign. The bill is racist and xenophobic, and should be challenged, as well as the racist mindset of people who support it, which I still don't think is really the majority of people's opinions in the states. Not from younger people, anyways.