UPDATE: During an interview on The Ed Morrissey Show, Rubio said he would not support any legislation that does not guarantee enforcement and border security before the Green Card process starts.
"We have to make sure this law is structured in a way that guarantees enforcement," Rubio said, adding if we don't do both, enforcement and citizenship, we'll see another wave of undocumented people in the future.
Legislation is expected in March and possibly introduced to the Senate floor in April. President Obama will release his plan for immigration reform tomorrow.
A bipartisan group of...