REUTERS - Democratic presidential candidate Hillary Clinton called for a path to citizenship for undocumented immigrants during a campaign appearance in Nevada on Tuesday.

Clinton appeared at a Las Vegas high school Tuesday afternoon during her third campaign trip in an early-voting state after declaring last month that she would be seeking the presidency in November 2016.

"We can't wait any longer," to pass comprehensive immigration reform including a pathway to citizenship.

Rancho High School, is approximately 70 percent Hispanic and less than 10 miles north of theLas Vegas strip of casinos, a magnet for workers from all over the world.

Senator Marco Rubio of Florida, a Republican presidential candidate and son of Cuban immigrants, was a co-author of a bill that failed to pass in the Senate that would have given a path to citizenship to millions of undocumented immigrants.

Former Florida Governor Jeb Bush, a Republican who is weighing a White House bid, has proposed legal status for undocumented immigrants but has not ruled out a pathway to citizenship.

The Culinary Workers Union, which represents 55,000 Nevada casino workers from 167 countries, welcomed Clinton's focus on immigration issues.

"We look forward to learning about her policy proposals on this issue," said Yvanna Cancela, the union's political director.

The Culinary Workers is the largest union in Nevada and plays a pivotal role in Democratic politics in the state by using its resources to motivate voters. In 2008, the union endorsed now President Barack Obama as the party's nominee over Clinton, dividing the state's labor community.