Democrats could emerge as a near-permanent majority in poltics if the GOP doesn’t undertake a major overhaul, former Speaker Newt Gingrich (R-Ga.) said in a Friday letter to Republican National Committee members.

“Election night results have forced me to rethink everything I understood about how America makes political decisions,” Gingrich wrote. “Unless Republicans profoundly and deeply rethink their assumptions and study what the Democrats have been doing the future could become very bleak and the Clinton-Obama majority could become as dominant as the Roosevelt majority was from 1932 to 1968 presidentially and from 1930 to 1994 in the House of Representatives.”