The history of the U.S. exclusion policy can be traced back to allegations by a 1998 U.S. Congressional Commission that the technical information that American companies provided China for its commercial satellite ended up improving Chinese intercontinental ballistic missile technology. This was further aggravated in 2007 when China blew up a defunct meteorological satellite in low Earth orbit to test a ground-based anti-satellite (ASAT) missile. The debris created by the explosion contributed to the space junk that litter Earth's orbit, exposing other nations' space assets to the risk of accidental collision. The United States also fears the Chinese application of dual-use space technology for nefarious purposes. The U.S. imposed an embargo to the U.S. - China space cooperation throughout the 2000s and by 2011, a clause inserted by then-Congressman Frank Wolf in the 2011 U.S. federal budget forbids NASA from hosting or participating in a joint scientific activity with China.