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The flag-draped casket of former President George H.W. Bush is carried by a joint services military honor guard to lie in state in the rotunda of the U.S. Capitol, Monday, Dec. 3, 2018, in Washington.

TOPSHOT - The casket carrying former president George H.W. Bush is carried up the steps of the US Capitol in Washington, Monday, Dec. 3, 2018. / POOL PHOTODOUG MILLS/AFP/Getty Images

TOPSHOT - Former US President George W. Bush, and former First Lady Laura Bush, watch as the casket containing the remains of former US President George H.W. Bush arrive at the US Capitol during a State Funeral in Washington, DC, Dec. 3, 2018. SAUL LOEB/AFP/Getty Images

Former President George H.W. Bush is carried in by a military honor guard as he arrives to lie in State at the Capitol Rotunda on Capitol Hill in Washington, Monday, Dec. 3, 2018.

People take photos as the casket bearing the remains of former US President George H.W. Bush arrives at the US Capitol during the State Funeral in Washington, DC, Dec. 3, 2018. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images

Rep. Patrick McHenry (R-NC) and his daughter Cecilia pay their respects at the casket of the late former President George H.W. Bush as he lies in state at the U.S. Capitol, Dec. 4, 2018 in Washington, DC. A WWII combat veteran, Bush served as a member of Congress from Texas, ambassador to the United Nations, director of the CIA, vice president and 41st president of the United States. Bush will lie in state in the U.S. Capitol Rotunda until Wednesday morning.

Neil Bush, second from left, and his wife Maria, left, and members of their family pause at the flag-draped casket of former President George H.W. Bush, as he lies in state in the Capitol Rotunda in Washington, Monday, Dec. 3, 2018.

U.S. President Donald Trump salutes alongside first lady Melania Trump as they pay their respects to former U.S. President George H.W. Bush at the U.S Capitol Rotunda on Dec. 03, 2018 in Washington, DC. A WWII combat veteran, Bush served as a member of Congress from Texas, ambassador to the United Nations, director of the CIA, vice president and 41st president of the United States. A state funeral for Bush will be held in Washington over the next three days, beginning with him lying in state in the U.S. Capitol Rotunda until Wednesday morning.

U.S. Vice President Mike Pence (L), former President George W. Bush (C), former first lady Laura Bush and brother Jeb Bush, watch as the casket of former President George H.W. Bush arrives to lie in state in the U.S. Capitol Rotunda in Washington, DC, on Dec. 3, 2018. JONATHAN ERNST/AFP/Getty Images

Former Senator Bob Dole stands up and salutes the casket of the late former President George H.W. Bush as he lies in state at the U.S. Capitol, Dec. 4, 2018 in Washington, DC. A WWII combat veteran, Bush served as a member of Congress from Texas, ambassador to the United Nations, director of the CIA, vice president and 41st president of the United States. Bush will lie in state in the U.S. Capitol Rotunda until Wednesday morning.

Sully, the service dog, is seen as people pay respects, as the remains of former US President George H. W. Bush lie in state in the US Capitol's rotunda Dec. 4, 2018 in Washington, DC. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images

TOPSHOT - Stephen G. Leighton Jr. salutes as he pays his respects to former US President George H. W. Bush as he lies in state in the US Capitol's rotunda Dec. 3, 2018 in Washington, DC. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images

Cindy McCain pays her respects in front of the casket of the late former President George H.W. Bush as he lies in state in the U.S. Capitol Rotunda, Dec. 4, 2018 in Washington, DC. A WWII combat veteran, Bush served as a member of Congress from Texas, ambassador to the United Nations, director of the CIA, vice president and 41st president of the United States. Bush will lie in state in the U.S. Capitol Rotunda until Wednesday morning.

Billy Bush (2nd R) leaves after paying respects as the remains of former US President George H. W. Bush lie in state in the US Capitol's rotunda Dec. 4, 2018 in Washington, DC. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images

Visitors file past the flag-draped casket of former President George H.W. Bush as he lies in state in the Capitol Rotunda in Washington, Monday, Dec. 3, 2018.

People pay respects as the remains of former US President George H. W. Bush lie in state in the US Capitol's rotunda Dec. 4, 2018 in Washington, DC. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images

People pay respects as the remains of former US President George H. W. Bush lie in state in the US Capitol's rotunda Dec. 3, 2018 in Washington, DC. - The body of the late former President George H.W. Bush travelled from Houston to Washington, where he will lie in state at the US Capitol through Wednesday morning. Bush, who died on Nov. 30, will return to Houston for his funeral on Thursday. BRENDAN SMIALOWSKI/AFP/Getty Images