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: Washington (CNN) A stunning report by The Washington Post Monday said President Donald Trump revealed highly classified information to the Russian foreign minister and ambassador during last week's meeting at the White House. If proven true, that disclosure would mean Trump violated a key diplomatic principle for which he repeatedly hammered Democratic rival Hillary Clinton during the 2016 campaign. National security adviser H.R. McMaster said in a statement provided by White House press secretary Sean Spicer following the disclosure that Trump and the officials, Russian Foreign Minister Sergey Lavrov and Russian Ambassador to the US Sergey Kislyak, discussed "common threats."A published report cited officials who said Trump shared highly classified information with Russians last weekHe has repeatedly blasted others for sharing classified information 
 Question:"If elected, Hillary Clinton would become the first president of the United States who wouldn't be able to pass a background check," _ added.

Donald Trump