Biden tells military that global warming is the biggest threat to the United States -- and that he's not joking. Rush on when Obama said global warming was the biggest threat. Rep. Andy Biggs (R-AZ): Dems campaigned on global warming. Rep. Carlos Gimenez (R-FL) on the root cause of the current border crisis: Joe Biden and Kamala Harris. Developer pulls plug on Keystone XL pipeline, more jobs killed by Biden. Tricia Burns, the owner of fitness studio, choked up over jobs lost. Rush on Keystone in 2013. Callers on Keystone and illegal immigration.