If a Cuban stows away on an airplane or takes a boat to Key West and touches American soil....
what will their citizenship status eventually become?
And do ANY Republicans disapprove of that action?
Different situation then the Mexicans, for a myriad of reasons.
There is no political prosecutions in Mexico,
Mexico is a Democracy. Numbers of Cubans doing such a thing are minuscule and can be taken on a case by case basis.
People from Mexico just walk over the border, in huge numbers. So that is a security concern, a national interest concern, while cuban refugees are not.