Here's what the president said:
"On this solemn day," the statement read, "we mourn the loss of Barbara Bush, an outstanding and memorable woman of character. As a wife, mother, grandmother, great-grandmother, military spouse, and former First Lady, Mrs. Bush was an advocate of the American family."
"Mrs. Bush lived a life that reminds us always to cherish our relationships with friends, family, and all acquaintances," the statement continued. "In the spirit of the memory of Mrs. Bush, may we always remember to be kind to one another and to put the care of others first."
"As a mark of respect for the memory of Barbara Bush, I hereby order," it added, "by the authority vested in me by the Constitution and the laws of the United States of America, that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, on the day of interment."
"I also direct that the flag shall be flown at half-staff for the same period at all United States embassies, legations, consular offices, and other facilities abroad, including all military facilities and naval vessels and stations," the statement concluded.
Barbara Bush died on Tuesday at the age of 92 after the Bush family had released a statement Sunday indicating that she was in failing health and was denying further health care to focus on comfort. She spent her last moments surrounded with her family.
"Strong devotion to country and family"
In a previous statement on Tuesday, the president and the first lady praised Barbara Bush for her efforts in advocating for literacy.
"Among her greatest achievements was recognizing the importance of literacy as a fundamental family value that requires nurturing and protection," the statement read. "She will be long remembered for her strong devotion to country and family, both of which she served unfailingly well."
"The President and First Lady's thoughts and prayers are with the family and friends of Mrs. Bush," it concluded.