Marco Rubio, are again pushing a temporary guest worker program that is favored by the business community and agricultural interests that depend on seasonal employment.

CNN: Unions could again be key to immigration reform

On Tuesday, Republican Party platform drafters agreed to add a plank calling for a guest worker program for temporary migrants.

FORBES: The GOP Battle Over Immigration Policy

Still, Republicans and Democrats placed strict new conditions on the immigration measure on Wednesday, voting overwhelmingly to slash the number of foreign workers who could come to the U.S. on temporary visas, capping the guest-worker program at 200, 000 a year.

NPR: Bush Touts Deals on Iraq, Immigration; Chides Iran

Second, the bracero program, a temporary annual guest worker permit for low skilled Mexican farm workers, was discontinued on the eve of the Immigration Act of 1965 due to labor union pressure.

FORBES: The Rise of Asian Immigration

Unlike in 1986, growers and worker advocates say the current reform proposal would also ensure that a poor, illegal class of farmworkers isn't created again by including a viable guest worker program that would allow for a flow of legal temporary workers into California's fields.

NPR: In Prior Overhaul, Legalized Farmworkers Prospered

Any proposal to allow immigrants to obtain permanent legal residence through a guest-worker program, regardless of whether they are in the country illegally or came with temporary work visas, could, in the end, look a bit like some form of amnesty.

CNN: Wallace