This was debunked by polifact.  In short... "By any CBO projection and under any proposed legislation, Medicaid spending will increase over the next decade — because health care costs are increasing. The House health care bill limits that increase to 20 percent, while maintaining the status quo requires a 60 percent increase, according to the CBO."
http://www.politifact.com/punditfact/statements/2017/jun/28/newt-gingrich/gingrich-misleads-point-house-bill-grows-medicaid-/