On the May 1 broadcast of his nationally syndicated radio show, Bill O'Reilly said that the “organizers” of the May 1 nationwide pro-immigrant protests have a “hardcore militant agenda of 'You stole our land, you bad gringos.' ” O'Reilly said that the “slogan” of the demonstrations' organizers was "[W]e didn't cross the border, the border crossed us" and that this meant that the organizers believed that Americans “stole [their] land.” The organizers' hidden “agenda underneath,” said O'Reilly, was that “now, we're going to take it back by massive, massive migration into the Southwest.”

O'Reilly joins other conservative media figures who have claimed that the immigrant leaders' true agenda is to reclaim the American Southwest, which the United States acquired as part of the treaty ending the Mexican War (1846-48).

From the May 1 broadcast of Westwood One's The Radio Factor with Bill O'Reilly:

O'REILLY: And then there's the hardcore militant agenda of “You stole our land, you bad gringos.” This is the organizers of these demonstrations: “The border -- we didn't cross the border, the border crossed us.” That is their slogan. That you stole our land, and now, we're going to take it back by massive, massive migration into the Southwest. And we're going to control those places, because you stole it from us, and that's the agenda underneath.