This is a topic on Cato, Reason, and several other prominent publications of the right. Here's one: http://www.cato-unbound.org/2014/08/04/matt-zwolinski/pragma... and another one: http://reason.com/archives/2013/11/26/scrap-the-welfare-stat...

Disagreements on implementation are real (some on the right want this implemented only as Friedman's negative income tax, which is not a true GBI, and some on the left want a GBI in addition to the current welfare state), but there is still significant agreement, especially over the past few years.