Recent Republican solidarity on illegal immigration is showing cracks under pressure from agriculture groups, with two GOP congressmen floating programs that would make it easier for foreigners to work legally in U.S. fields and orchards.

Labor researchers say more than 1.4 million people are employed as field workers in the U.S. each year, and the Labor Department estimates more than half of them are here illegally. Grower groups say that number exceeds 75%, and say measures pending in Congress could deprive Americans of homegrown food.