Former president George W. Bush is not expected to attend a Thursday event at the White House honoring his late mother, two White House officials familiar with the plans told The Washington Post. First lady Melania Trump is hosting the event in the East Room, where she will unveil a postage stamp honoring former first lady Barbara Bush, the wife of President George H.W. Bush. Other Bush family members and friends are expected to attend, Trump’s office said. Attendees include Doro Bush Koch, George W. Bush’s younger sister who is listed as one of several featured speakers at the unveiling,...