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 SessionsThe Memo: Trump lowers the temperature on Mueller probe Sessions warned White House he could quit if Trump fired Rosenstein: report Impeaching Rosenstein? Some Republicans are talking about it 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 McCainTrump considering pardon for boxing legend after call from Sylvester Stallone GOP poised to advance rules change to speed up Trump nominees The Hill's Morning Report: Inside the Comey memos MORE (R-Ariz.), Lindsey GrahamLindsey Olin GrahamGOP sold Americans a bill of goods with tax reform law Republicans divided over legislation protecting Mueller Rand Paul under pressure as Pompeo hunts for votes MORE (R-S.C.), Jeff FlakeJeffrey (Jeff) Lane FlakePompeo lacks votes for positive vote on panel Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes Arizona GOP tinkers with election rules with an eye on McCain's seat MORE (R-Ariz.), Charles SchumerCharles (Chuck) Ellis SchumerThrowing some cold water on all of the Korean summit optimism House Republicans push Mulvaney, Trump to rescind Gateway funds Congress should build on the momentum from spending bill MORE (D-N.Y.), Dick DurbinRichard (Dick) Joseph DurbinHannity, Kimmel, Farrow among Time's '100 Most Influential' The Hill's Morning Report: 200 Days to the Election Dems walk tightrope on Pompeo nomination MORE (D-Ill.), Bob MenendezRobert (Bob) MenendezPoll: Menendez has 17-point lead over GOP challenger Russian attacks on America require bipartisan response from Congress Justice Dept intends to re-try Menendez in corruption case MORE (D-N.J.) and Michael BennetMichael Farrand BennetOvernight Health Care: GOP pushes stiff work requirements for food stamps | Johnny Isakson opens up about family's tragic loss to opioids | Republicans refuse to back vulnerable Dem's opioids bill | Dems offer new public option plan Lawmakers discuss Latino education gap The Hill's Morning Report: Hannity drawn into Cohen legal fight MORE (D-Co.) comprise the Gang of Eight.