Chinese exclusion policy of NASA

Due to alleged security concerns, all researchers from the U.S. National Aeronautics and Space Administration (NASA) are prohibited from working bilaterally with Chinese citizens affiliated with a Chinese state enterprise or entity. In April 2011, the 112th United States Congress banned NASA from using its funds to host Chinese visitors at NASA facilities.

History
Despite growing trade ties between both countries, a close scientific partnership with China has been rejected by several American politicians including Rep. Frank Wolf (R-VA), who in 1999 stated: "'They [China] are the evil empire'."

In 2010, Rep. John Culberson (R-TX) urged President Barack Obama not to allow further contact between NASA and the China National Space Administration (CNSA). In a letter addressed to the President, he wrote:

"I have grave concerns about the nature and goals of China’s space program and strongly oppose any cooperation between NASA and CNSA’s human space flight programs without Congressional authorization."

In April 2011, the 112th United States Congress banned NASA from engaging in bilateral agreements and coordination with China. As stated under Public Law 112-55, SEC. 539:

Response
Dean Cheng from the Heritage Foundation claimed more interaction with the Chinese is possible in the area of sharing already collected data. Cheng claims sharing data such as Geodesy information and lunar conditions may "help create a pattern of interaction that might lower some of the barriers to information exchange."

Increased cooperation between China, Europe and Russia
Since the mid-2000s, China, Russia and Europe have been working together towards manned deep space exploration as highlighted by Mars-500, a joint Chinese-European-Russian experiment that will provide ground-based studies to complement orbital research in preparation for a planned manned mission to Mars. In 2011, the German Aerospace Center collaborated with Chinese scientists in the Shenzhou program, marking the first time both countries worked together on one of China's Shenzhou missions.

Criticism
Geoffrey Marcy, an astronomy professor at the University of California, Berkeley, called the ban "completely shameful and unethical". Sir Martin Rees, the current Astronomer Royal of Great Britain, called the ban a "deplorable 'own goal' by the US".

In 2013, a number of American scientists decided to boycott a NASA meeting, with senior academics either withdrawing individually, or pulling out their entire research groups. This was in response to actions by officials at NASA Ames to prohibit Chinese nationals from attending the Kepler Science Conference II. Rep. Frank Wolf was quick to respond in a letter to NASA Administrator Charlie Bolden, saying that the restriction only applied to bilateral meetings and activities between NASA and the Chinese government or Chinese-owned companies. The NASA Ames officials had mischaracterized the law as Kepler Science Conference II is a multilateral event.