Rubio and the other seven bipartisan members of the Gang of Eight introduced their comprehensive immigration reform plan on Tuesday, but an unveiling event was postponed until Thursday because of the Boston Marathon bombings.

The Border Security, Economic Opportunity, and Immigration Modernization Act would create a pathway to citizenship for immigrants already in the country illegally, toughen border security, create a guest worker program and boost high-skilled immigration.

Rubio said S. 744, isn’t perfect, but that there will be plenty of time for senators to make changes and provide input during the committee and amendment process. He said the more than 800-page bill likely wouldn’t reach the Senate floor until next month.

Republicans, including Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsDems pick up deep-red legislative seat in Missouri Grassley to Sessions: Policy for employees does not comply with the law New immigration policy leaves asylum seekers in the lurch MORE (R-Ala.), have complained that the Gang of Eight process was behind closed doors, and have expressed concerns that the bill would be rushed to the floor.

“One other criticism is that it’s being rushed through,” Rubio said. “That’s just not true. ... People are going to have three to four weeks to review it.”

On Friday, the Senate Judiciary Committee will begin to look at the legislation.

Rubio said the bill requires border enforcement measures before any of the 11 million people within the United States illegally were given the opportunity to apply for a green cards.

Rubio and Sens. John McCainJohn Sidney McCainMcConnell: 'Whoever gets to 60 wins' on immigration Meghan McCain: Melania is 'my favorite Trump, by far' Kelly says Trump not likely to extend DACA deadline MORE (R-Ariz.), Lindsey GrahamLindsey Olin GrahamMcConnell: 'Whoever gets to 60 wins' on immigration Overnight Tech: Uber exec says 'no justification' for covering up hack | Apple considers battery rebates | Regulators talk bitcoin | SpaceX launches world's most powerful rocket Overnight Cybersecurity: Tillerson proposes new cyber bureau at State | Senate bill would clarify cross-border data rules | Uber exec says 'no justification' for covering up breach MORE (R-S.C.), Jeff FlakeJeffrey (Jeff) Lane FlakeMcConnell: 'Whoever gets to 60 wins' on immigration Huckabee Sanders: Dems need to decide if they 'hate' Trump 'more than they love this country' Trump spokeswoman fires back at Flake: 'His numbers are in the tank' MORE (R-Ariz.), Charles SchumerCharles (Chuck) Ellis SchumerGOP lawmaker: Dems not standing for Trump is 'un-American' Trump called for unity — he didn’t even last a week Overnight Defense: GOP plays hardball by attaching defense funding to CR | US reportedly drawing down in Iraq | Russia, US meet arms treaty deadline | Why the military wants 6B from Congress MORE (D-N.Y.), Dick DurbinRichard (Dick) Joseph DurbinDems confront Kelly after he calls some immigrants 'lazy' McConnell: 'Whoever gets to 60 wins' on immigration Hoyer: DACA deal a long ways off MORE (D-Ill.), Bob MenendezRobert (Bob) MenendezJustice Dept intends to re-try Menendez in corruption case DACA is neither bipartisan nor in America's interest Senate DACA deal picks up GOP supporters MORE (D-N.J.) and Michael BennetMichael Farrand BennetGOP Senate candidate fundraising lags behind Dems in key races Dem shutdown strategy: Force McConnell to deal DACA is neither bipartisan nor in America's interest MORE (D-Co.) comprise the Gang of Eight.