Media playback is unsupported on your device Media caption President Obama: ''They are woven into the fabric of our lives''

President Barack Obama has said the time has come for a sweeping overhaul of the US immigration system.

He made his case at a high school in Las Vegas, Nevada, a day after a bipartisan group of senators outlined a framework for reform.

The White House and senators envisage a path to citizenship for many of an estimated 11 million undocumented immigrants in the US.

The move reflects the growing influence of Hispanic voters.

In his opening remarks, Mr Obama said: "The time has come for common-sense, comprehensive immigration reform."

He noted that the current system was "out of date and badly broken".

Bipartisan approach?

Mr Obama's case for an immigration revamp reflects a blueprint he rolled out in 2011, though that did not go far, to the disappointment of Latino voters.

Analysis President Obama knows a winning strategy when he sees one. He has passionately declared: "Now is the time" for immigration reform. In doing so, he has backed the bipartisan Senate plan including making illegal immigrants pay taxes and fines, and sending them to the back of the queue before they can become American citizens. Republicans won't want him to say much more - his endorsement could make it hard for them to back any plan. But many Republicans see this is as the last chance to convince Latino voters they are not bigots. It seems the president can't lose. He might well get agreement on the plan he wants. But if he fails, he will have stoked splits in the Republican party and virtually ensured they are blamed by Latino voters.

On Tuesday, the US president championed the proposals outlined a day earlier by a group of four Democratic and four Republican senators.

"The good news is that for the first time in many years Republicans and Democrats seem ready to tackle this problem together," he said.

But Mr Obama added that if Congress did not take action, the White House would write legislation of its own and insist that lawmakers vote on it.

Like the bipartisan plan, the president also backed an overhaul of the existing legal immigration system and securing US borders.

His 2011 blueprint also focused on a path to permanent residency and eventual citizenship, as well as making it easier for businesses to verify the legal status of workers.

After eight years, individuals would be allowed to become legal permanent residents and could eventually become citizens five years later.

Appeal to Hispanics

Under the White House and senators' plans, undocumented immigrants would be allowed to live and work in the US legally as long as they pass background checks and pay back-taxes.

US immigration reform efforts 2006: Bipartisan bill featuring enhanced border security, a guest worker programme and a path to citizenship passes the Senate with President George Bush's endorsement but dies in the Republican-led House

Bipartisan bill featuring enhanced border security, a guest worker programme and a path to citizenship passes the Senate with President George Bush's endorsement but dies in the Republican-led House 2007: A similar bill fails in the Senate after conservatives complain citizenship provisions would reward lawbreakers

A similar bill fails in the Senate after conservatives complain citizenship provisions would reward lawbreakers 2010: Senate Democrats backed by President Obama push so-called Dream Act - legislation to grant citizenship to some undocumented immigrants brought to the US as children; it dies amid Republican opposition

Senate Democrats backed by President Obama push so-called Dream Act - legislation to grant citizenship to some undocumented immigrants brought to the US as children; it dies amid Republican opposition August 2012: President Obama uses his executive authority to create a mechanism similar to the Dream Act; Republicans complain he usurped their constitutional authority

President Obama uses his executive authority to create a mechanism similar to the Dream Act; Republicans complain he usurped their constitutional authority November 2012: Hispanic voters, driven partly by anger at Republican opposition to immigration reform, overwhelmingly back Mr Obama and the Democrats in the election

Once immigrants were able to apply for permanent residency, they would do so behind everyone else who had already applied for a green card.

But the senators' proposals would allow undocumented immigrants to start the process of becoming citizens only after US borders are deemed secure, a link that did not feature in the president's plan.

The so-called gang of eight hope their blueprint could pass the Senate by summer.

Such a bill would face a tougher route in the Republican-controlled House of Representatives.

But many Republicans recognise their party's hard line on immigration has become a liability, after November's election when the Democratic president won more than 70% of the Latino vote.

Arizona Senator John McCain, the former Republican presidential candidate who lost to Mr Obama in 2008, said on Monday: "The Republican Party is losing the support of our Hispanic citizens."