There are 49 states to go in the primary process (though many won't matter) and Rubio will be appearing all over the place as this campaign rolls along. All it takes is one person to stand up in a town hall or a diner filled with reporters and confront him by demanding an answer for the record on his involvement with Schumer and the gang.
As I have said before one key that Cruz used to defeat them in the Senate was the issue of voting. When he wrote the amendment to take citizenship off the table, the senate dropped the bill. We can do the same thing and take it up a notch by asking if they believe any background check should include cross checking voter registration roles to see if people living here illegally have also committed felony vote fraud and if that should get them a ticket home, never to return.
My guess is Trump is the only one who would say "yes".
When he wrote the amendment to take citizenship off the table, the senate dropped the bill
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The Senate dropped Cruz’s amendment and passed the bill. The only thing that saved the country was us voters of the 7th VA voting out the weasel Eric Cantor. They were ready to pass it through the House with Democrat votes after Cantor’s primary.
Rubio is fully committed to abandoning the rule of law and giving away the country. I will not vote for that.