Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) A group of 375 "concerned" scientists -- including famed physicist Stephen Hawking -- released an open letter Tuesday sharply criticizing Donald Trump, citing the threat of climate change and blasting his push for the US to leave the Paris Accord. "It is of great concern that the Republican nominee for President has advocated U.S. withdrawal from the Paris Accord. A 'Parexit' would send a clear signal to the rest of the world: 'The United States does not care about the global problems of human-caused climate change. You are on your own,'" the group wrote on the website responsiblescientists.org. The use of the term "Parexit" is a reference to a political withdrawal along the lines of the UK's vote to leave the European Union, commonly called the "Brexit."A group of scientists released an open letter on Tuesday urging action on climate changeThe scientists called for support of the Paris climate change agreement 
 Question:CNN reached out to the _ campaign for a response to the letter, but did not immediately receive a response.

Donald Trump