Marco Rubio was direct about the biggest challenge he has as his comprehensive immigration reform bill is released this week. “It’s going to require a lot of communication,” said Rubio on a conference call with reporters Tuesday evening.

It was the understatement of the year from Rubio, who has worked for the last month with seven other senators, four Democrats and three fellow Republicans, on a compromise in three realms of immigration policy: modernization, enforcement, and legalization. Conservatives in the GOP, who effectively torpedoed the 2007 immigration proposal, will need to be convinced. But Rubio was quick to point out that the bill he and the rest of the “Gang of 8” are releasing is only the beginning of the process.