In this Nov. 11, 2014, file photo, former President George H.W. Bush acknowledges the crowd at his presidential library before his son former President George W. Bush discusses his new book “41: A Portrait of My Father” in College Station, Texas. Former President George H.W. Bush has fallen at home Wednesday, July 15, 2015, in Kennebunkport, Maine, and broken a bone in his neck.
(AP Photo/Texas Tribune, Bob Daemmrich, Pool, File)
AP Photo/Texas Tribune, Bob Daemmrich, Pool, File
In this April 4, 2014 file photo, portraits of former Presidents George W. Bush, left, and his father, George H.W. Bush, both painted by George W. Bush, are on display as part of “The Art of Leadership: A President’s Diplomacy” exhibit at the George W. Bush Presidential Library and Museum in Dallas. Bush has said that an essay by Winston Churchill on painting inspired him to take lessons after leaving office.
(AP Photo/Benny Snyder, File)
AP Photo/Benny Snyder, File
In this Sunday, June 7, 2015 photo provided by the Office of George Bush, the Bush family poses for a photo at the family estate in Kennebunkport, Maine. The family gathered for a gala planned to celebrate Barbara Bush’s 90th birthday on Monday. Among those present are former President George H.W. Bush, seated front row center, his wife and former first lady Barbara Bush, second row center, former President George W. Bush, third row center, his wife and former first lady Laura Bush, second row third from left, former Florida Gov. Jeb Bush, back row sixth from right, and his wife Columbia Bush, second row fourth from left.
(Evan Sisley/Office of George Bush via AP)
Evan Sisley/Office of George Bush via AP
In this March 29, 2015, file photo, former President George H.W. Bush and his wife Barbara Bush, left, speak before a college basketball regional final game between Gonzaga and Duke, in the NCAA basketball tournament in Houston. Bush has fallen at home Wednesday, July 15, 2015, in Kennebunkport, Maine, and broken a bone in his neck.
(AP Photo/David J. Phillip, File)
AP Photo/David J. Phillip, File
In this March 29, 2015, photo, former President George H.W. Bush and his wife Barbara Bush speak before the first half of a college basketball game in Houston.
(AP Photo/David J. Phillip, File)
AP Photo/David J. Phillip, File
Former President George H.W. Bush, seated, arrives at the River Oaks Country Club just before the quarterfinal match between Jeremy Chardy of France and Kevin Anderson from South Africa was suspended by rain at the U.S. Men’s Clay Court Championship Friday, April 10, 2015, in Houston.
(AP Photo/Pat Sullivan)
AP Photo/Pat Sullivan
Former president George W. Bush, wipes a tear after his speech during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. Left is President George H.W. Bush.
(AP Photo/David J. Phillip)
AP Photo/David J. Phillip
Former President George H.W. Bush, wears pink socks as he is seated in a wheelchair with, from left, first lady Michelle Obama, President Barack Obama, former first lady Barbara Bush, and former President George W. Bush, at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013.
(AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
President Barack Obama stands with, from second from left, former Presidents George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013.
(AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
President Clinton is greeted by former President George Bush as he arrives at the U.S. Capitol for inauguration ceremonies Saturday, Jan. 20, 2001, in Washington.
(AP Photo/Ron Edmonds)
AP Photo/Ron Edmonds
President Barack Obama pauses with former Presidents George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter during the dedication of the George W. Bush Presidential Center at the George W. Bush Presidential Library and Museum on the campus of Southern Methodist University in Dallas, Texas, April 25, 2013. (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.
(The White House/Pete Souza)
The White House/Pete Souza
Traditional Russian wooden dolls called Matreska depict US presidents, from left, George H.W. Bush, Bill Clinton, George W. Bush, Barack Obama and US presidential candidate Donald Trump displayed in a shop in Moscow, Russia on Tuesday, Nov. 8, 2016. Tens of millions of voters across the United States will now decide on the next occupant of the White House as polling stations open across the country.
(AP Photo/Pavel Golovkin)
AP Photo/Pavel Golovkin
In this July 4, 2007, file photo, former U.S. President George H.W. Bush watches his tee shot on the 18th tee during the AT&T Earl Woods Memorial Pro-Am at Congressional Country Club in Bethesda, Md. Bush was once known for playing golf at breakneck speed. Now collectors have an opportunity to own some of his golfing history. Robert Livingston from RR Auction said Bush gave the items to a worker at the Cape Arundel Golf Club in Maine, where the 41st president spends his summers. The auction ends Wednesday, Nov. 9, 2016.
(AP Photo/Nick Wass, File)
AP Photo/Nick Wass, File
Former President George H.W. Bush arrives at NRG Stadium to help celebrate Salute to Service day before an NFL football game between the Houston Texans and the Detroit Lions, Sunday, Oct. 30, 2016, in Houston.
(AP Photo/Eric Christian Smith)
AP Photo/Eric Christian Smith
In this Oct. 15, 1992, file photo President George H.W. Bush looks at his watch during the 1992 presidential campaign debate with other candidates, Independent Ross Perot, top, and Democrat Bill Clinton, at the University of Richmond, Va. For presidential candidates, the town hall debate is a test of stagecraft as much as substance. When Hillary Clinton and Donald Trump meet in the Sunday, Oct.9, 2016, contest, they’ll be fielding questions from undecided voters seated nearby. In an added dose of unpredictability, the format allows the candidates to move around the stage, putting them in unusually close proximity to each other.
(AP Photo/Ron Edmonds, File)
AP Photo/Ron Edmonds, File
U.S. President-elect Ronald Reagan, left, and Vice President-elect George Bush share a laugh during their first news conference in which they announced their transitional team in Los Angeles, Ca., Nov. 6, 1980.
(AP Photo)
AP Photo
In this Aug. 18, 1988 file photo, Republican presidential candidate, Vice President George H.W. Bush, right, and his running mate Sen. Dan Quayle, R-Ind., wave to the assembly of the Republican National Convention in New Orleans after their acceptance speeches for the presidential and vice-presidential nomination.
(AP Photo/J. Scott Applewhite, File)
AP Photo/J. Scott Applewhite, File
In this Dec. 7, 2009 file photo, former President George H.W. Bush and former first lady Barbara Bush arrive for a ceremony to dedicate an expanded gallery that carries his name at the National Museum of the Pacific War, in Fredericksburg, Texas. Barbara Bush is celebrating her 91st birthday with her family in Maine. She and former President George H.W. Bush are being joined by family members including their son, former President George W. Bush, to help her celebrate on Wednesday, June 8, 2016.
(AP Photo/Eric Gay, File)
