The immigration reform bill released early Wednesday morning by a bipartisan group of eight senators is more than 800 pages long.

The bill would create a pathway to citizenship for illegal immigrants already in the country, heighten border security and create guest-worker and high-skilled immigration programs.

It was released at 2 a.m. Wednesday by Sen. Charles SchumerCharles SchumerDemocrats and the boycott of Trump's inauguration The Hill's 12:30 Report Why Democrats fear a successful inaugural address from Trump MORE (D-N.Y.), one of four Democrats in the Gang of Eight, and it runs 844 pages long.

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The measure faces a tough fight in Congress, with conservative Republicans expressing concern that lawmakers are rushing to pass immigration reform.

Early reports suggested that the bill could be as long as 1,500 pages.

“I’m for immigration reform, but we have 1,600 pages,” Sen. Rand PaulRand PaulDems blast Trump plans for deep spending cuts Trump team prepares dramatic cuts Paul, Lee call on Trump to work with Congress on foreign policy MORE (R-Ky.) had said. “We’re going to read the details and try to make it acceptable to conservatives.”

Sen. Marco RubioMarco RubioGOP, Dems hear different things from Trump Senate committee to vote Monday on Tillerson Tillerson met with top State official: report MORE (R-Fla.) a member of the bipartisan group, defended the bill in a statement Wednesday.

"This bill marks the beginning of an important debate, and I believe it will fix our broken system by securing our borders, improving interior enforcement, modernizing our legal immigration to help create jobs and protect American workers, and dealing with our undocumented population in a tough but humane way that is fair to those trying to come here the right way and linked to achieving several security triggers," Rubio said.

He called the legislation a "strong conservative effort."

"While I believe this legislation is a strong conservative effort that will accomplish all these things and tries to make the best of the imperfect reality we face, it’s not perfect. But I am also confident that an open and transparent process that welcomes public input is going to make it even better," Rubio added.

President Obama on Tuesday hailed the bill as “largely consistent” with his own ideas for overhauling the nation’s immigration laws.

Schumer and Sen. John McCainJohn McCainSenate committee to vote Monday on Tillerson Trump fails to mention Clinton in inaugural address Hillary Clinton under microscope at inauguration MORE (R-Ariz.) met with Obama at the White House Tuesday and briefed him on the bill. Obama has made immigration reform a second-term priority and a separate group in the House is working on its own immigration bill.

Along with Schumer, McCain, and Rubio, Sens. Lindsey GrahamLindsey GrahamThe Hill's 12:30 Report Graham: Trump would make mistake in not punishing Russia Graham to vote for Trump’s EPA pick MORE (R-S.C.), Jeff FlakeJeff FlakeLive coverage of Trump's inauguration Under Trump, the disruptors return to Washington (that's a good thing) 9 GOP senators Trump must watch out for MORE (R-Ariz.), Dick DurbinDick DurbinJustice requires higher standard than Sessions Warren burns Mnuchin over failure to disclose assets Trump Treasury pick to defend foreclosure record MORE (D-Ill.), Robert MenendezRobert MenendezCarson likely to roll back housing equality rule Live coverage: Tillerson's hearing for State Booker to join Foreign Relations Committee MORE (D-N.J.) and Michael BennetMichael BennetOvernight Finance: Scoop – Trump team eyes dramatic spending cuts | Treasury pick survives stormy hearing Mnuchin: Debt limit increase important, unclear on 'clean' hike Live coverage: Senators grill Trump's Treasury pick MORE (D-Colo.) round out the Gang of Eight.

The senators had intended to roll out their legislation earlier but delayed an event after the deadly terror attack in Boston on Monday. 

Read the bill below:

Gang of Eight immigration reform plan