Bill Clinton mainly criticized chemical weapons. bush upped the ante by talking about nukes.
However, it’s important to note that Clinton focused on chemical weapons and did not bring up nuclear weapons, as Bush would later do.
"The Senate will vote on ratification of the Chemical Weapons Convention," Clinton said. "By voting for this treaty, the Senate can help to banish poison gas from the earth, and make America's citizens and soldiers much more secure. … The treaty will increase the safety of our citizens at home, as well as our troops in the field. The destruction of current stockpiles, including at least 40,000 tons of poison gas in Russia alone, will put the largest potential sources of chemical weapons out of the reach of terrorists, and the trade controls will deny terrorists easy access to the ingredients they seek."
Bush, by contrast, would later make much more sweeping claims.
For instance, in a weekly radio address on Sept. 14, 2002, Bush said of Hussein-era Iraq, "Today this regime likely maintains stockpiles of chemical and biological agents, and is improving and expanding facilities capable of producing chemical and biological weapons. Today Saddam Hussein has the scientists and infrastructure for a nuclear weapons program, and has illicitly sought to purchase the equipment needed to enrich uranium for a nuclear weapon. Should his regime acquire fissile material, it would be able to build a nuclear weapon within a year."
http://www.politifact.com/truth-o-m...ays-bill-clinton-george-w-bush-had-basically/
