Rubio was responding to a question from a constituent on why the immigration bill can’t be dealt with in a piecemeal approach rather than a large comprehensive bill. Rubio said that because immigration reform is “complex,” a large bill is the best approach. He said that border enforcement and worker visas have to be dealt with at the same time because the issues are "interwoven."

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“The problem with immigration though is that it is complex because it is all interwoven,” Rubio said. “It’s all related to each other. It’s literally impossible to do one part without doing the other.”

The Senate is expected to begin floor debate on the Border Security, Economic Opportunity, and Immigration Modernization Act later this month.

The bipartisan group of eight senators, known as the Gang of Eight, introduced S. 744, which would create a pathway to citizenship for illegal immigrants already in the country, toughen border security, create a guest worker program and boost high-skilled immigration.

Sens. Rubio, John McCainJohn McCainBush biographer: Trump has moved the goalpost for civilized society White House to pressure McConnell on ObamaCare McCain: Trump needs to state difference between bigots and those fighting hate MORE (R-Ariz.), Lindsey GrahamLindsey GrahamGraham: Trump's Charlottesville rhetoric 'dividing Americans, not healing them' OPINION: Congress should censure Trump for his unfit conduct Supporting 'Dreamers' is our civic and moral duty MORE (R-S.C.), Jeff FlakeJeff FlakeOPINION: Congress should censure Trump for his unfit conduct Club for Growth endorses Nicholson in Wisconsin GOP primary Immigration battlefield widens for Trump, GOP MORE (R- Ariz.), Chuck SchumerCharles SchumerDemocrats urge Trump to condemn Charlottesville violence Melania Trump on Charlottesville protests: 'No good comes from violence' It's time for McConnell to fight with Trump instead of against him MORE (D-N.Y.), Richard DurbinDick DurbinOPINION | DACA helps people achieve the American dream, don't take it away Immigration battlefield widens for Trump, GOP 'Dreamers' deadline looms for Trump MORE (D-Ill.), Robert MenendezRobert (Bob) MenendezLawmakers target horse meat trade Senators, staff get approval to testify in Menendez corruption trial Trump admin not opposed to new war authorization MORE (D-N.J.) and Michael BennetMichael Farrand BennetNFL player points to Charlottesville after national anthem protest Trump quietly putting his stamp on the courts Overnight Energy: Senate begins moving energy nominations | Interior watchdog probing Zinke calls MORE (D-Co.) comprise the Gang of Eight.

The Senate Judiciary Committee passed the bill out of committee last month on a bipartisan vote. Rubio said more work is needed to improve the legislation so it can pass in the House.

“There will have to be improvements,” Rubio said. “Because the good thing is the American people, the vast majority of them throughout the political spectrum, have clearly said that they are prepared to responsibly deal with those that are here illegally, but they are only willing to do so if we can take measures that ensure that this problem will never happen again in the future. And so, if we can make sure we put in place enforcement mechanisms and a guest worker program that ensures this will never happen again in the future, we’re going to have responsible immigration reform. And if we don’t have that, then we won’t have immigration reform.”

Some Republicans have complained that the legislation is being rushed through, and that it would provide amnesty for illegal residents before strengthening border enforcement enough.

House Republicans have said they will produce their own immigration reform bill, but that it would likely be passed in pieces rather than one large comprehensive bill.