Definition: Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
Input: Trump  wrote on Twitter this morning that it's "so disgraceful that a person illegally in our country killed [Indianapolis] Colts linebacker Edwin Jackson. This is just one of many such preventable tragedies. We must get the Dems to get tough on the Border  and with illegal immigration  FAST!"
So disgraceful that a person illegally in our country killed @Colts linebacker Edwin Jackson. This is just one of many such preventable tragedies. We must get the Dems to get tough on the Border  and with illegal immigration  FAST! — Donald J. Trump (@realDonaldTrump) February 6  2018
My prayers and best wishes are with the family of Edwin Jackson  a wonderful young man whose life was so senselessly taken. @Colts —  Donald J. Trump (@realDonaldTrump) February 6  2018
This isn't the first time  Trump  has invoked the deaths of Americans to argue against illegal immigration.  He  has often referenced the San Francisco pier case  in which an undocumented immigrant who had been deported multiple times was accused of fatally shooting a 32-year-old Kate Steinle on a pier. In that case  a jury found Jose Ines Garcia Zarate not guilty of Steinle's July 2015 death.
Output:
Donald J. Trump