Mr. Reid announced his intentions on Univision’s “Al Punto,” a Spanish-language political talk show. His appearance was a pitch to Nevada’s Hispanic voters as he fights for re-election against Sharron Angle, a Tea Party-backed Republican with whom he is essentially tied in polls. Immigration is a dominant issue in the Nevada Senate race. And Hispanics, who turned out in droves to help elect President Obama in 2008, could give an edge to Mr. Reid.

The legislation, called the Dream Act, would grant conditional permanent residency to illegal immigrant students and illegal immigrants who agree to serve in the military.

“I have the right to bring that up any time I want; that’s why I brought it up the first time. I am a believer in our needing to do something,” Mr. Reid said in the interview, which was taped Thursday in Las Vegas.