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) -- Hero pilot Capt. Chesley "Sully" Sullenberger on Tuesday joined the opposition to heightened airport security procedures that critics have called invasive and intrusive. Sullenberger, who landed a crippled US Airways jet on the Hudson River last year, said the use of full-body pat-downs and advanced imaging scanners for airline personnel "just isn't an efficient use of our resources." Federal transport authorities say the machines are both safe and a necessary security precaution, especially following recent airline terrorism attempts. Sullenberger argued that transport authorities should trust pilots and flight attendants because "we're trusted partners" who are already "thoroughly screened."NEW: Civil liberties group files suit against Napolitano, PistoleNEW: Pistole praises work of TSA employees, pleads with public to work with screenersRep. John Mica sent a letter to aviation authorities discussing airport privatizationA public interest research group said it is suing DHS over scanner information 
 Question:But some passengers and pilots have expressed objections to _'s too-close-for-comfort pat-downs.

TSA