U.S. first lady Melania Trump welcomes guests for an International Women's Day luncheon in the State Dining Room at the White House in Washington, U.S. March 8, 2017. REUTERS/Jonathan Ernst - RTS1206P

U.S. President Donald Trump introduces first lady Melania Trump at the Freedom Ball in honor of his inauguration in Washington, U.S. January 20, 2017. REUTERS/Jonathan Ernst - RTSWMBN

U.S. first lady Melania Trump walks along the Colonnade at the White House in Washington, U.S. February 15, 2017. REUTERS/Kevin Lamarque - RTSYUAQ

U.S. first lady Melania Trump and China's first lady Peng Liyuan applaud after students performed for them at Bak Middle School of the Arts in West Palm Beach, Florida, U.S., April 7, 2017. REUTERS/Joe Skipper - RTX34MLF

U.S. President-elect Donald Trump's wife Melania carries a gift to present to U.S. first lady Michelle Obama and President Barack Obama as the Trumps arrive for tea before the inauguration at the White House in Washington, U.S. January 20, 2017. REUTERS/Jonathan Ernst - RTSWHI5

President Donald Trump waves as he walks with first lady Melania Trump during the inauguration parade on Pennsylvania Avenue in Washington, January 20, 2017. REUTERS/Evan Vucci/Pool TPX IMAGES OF THE DAY - RTSWLA0

U.S. President Donald Trump and first lady Melania Trump arrive at a "Make America Great Again" rally at Orlando-Melbourne International Airport in Melbourne, Florida, U.S. February 18, 2017. REUTERS/Kevin Lamarque - RTSZBL7

U.S. President Trump Addresses Joint Session of Congress - Washington, U.S. - 28/02/17 - U.S. first lady Melania Trump waves as she arrives ahead of President Trump's speech. REUTERS/Kevin Lamarque - RTS10VDB

President Donald Trump kisses his wife Melania Trump as he is joined by the Congressional leadership and his family to formally sign his cabinet nominations into law, at the Capitol in Washington, January 20, 2017. REUTERS/J. Scott Applewhite/Pool - RTSWL1I

U.S. First Lady Melania Trump (R) and Akie Abe, wife of Japanese Prime Minister Shinzo Abe, tour Morikami Museum and Japanese Gardens in Delray Beach, Florida, U.S., February 11, 2017. REUTERS/Joe Skipper - RTSY6PG

First Lady Melania Trump and U.S. President Donald Trump (not pictured) attend the 60th Annual Red Cross Gala at Mar-a-Lago club in Palm Beach, Florida, U.S., February 4, 2017. REUTERS/Carlos Barria - RTX2ZNRL

U.S. President Donald Trump (R) and first lady Melania Trump (2ndR) meet with Jordan’s King Abdullah (L) and Queen Rania in the Oval Office at the White House in Washington, U.S., April 5, 2017. REUTERS/Kevin Lamarque - RTX348OB

U.S. President Donald Trump and first lady Melania attend the Inaugural luncheon at the National Statuary Hall in Washington, U.S, January 20, 2017. REUTERS/Yuri Gripas - TPX IMAGES OF THE DAY - RTSWK4B

U.S. President Donald Trump and First Lady Melania Trump arrive to a church service at the National Cathedral in Washington, U.S., January 21, 2017. REUTERS/Carlos Barria - RTSWOZH

U.S. President Barack Obama (3rd L) and first lady Michelle Obama (L) greet U.S. President-elect Donald Trump and his wife Melania for tea before the inauguration at the White House in Washington, U.S. January 20, 2017. REUTERS/Jonathan Ernst - RTSWHJ2

U.S. President Donald Trump (R) and first lady Melania Trump (L) greet Israeli Prime Minister Benjamin Netanyahu and his wife Sara as they arrive at the South Portico of the White House in Washington, U.S., February 15, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY - RTSYUJJ

U.S. President Donald Trump and U.S. first lady Melania Trump walk with their son Barron to Marine One at the White House in Washington, U.S., March 17, 2017. REUTERS/Joshua Roberts TPX IMAGES OF THE DAY - RTX31JKI

U.S. first lady Melania Trump reads the children's book "Party Animals" at the 139th annual White House Easter Egg Roll on the South Lawn of the White House in Washington, U.S., April 17, 2017. REUTERS/Joshua Roberts - RTS12NPI

Melania Trump arrives on the West Front of the U.S. Capitol in Washington, D.C., U.S., January 20, 2017. REUTERS/Win McNamee/Pool - RTSWKJ6

Japanese Prime Minister Shinzo Abe and Akie Abe (R) attend dinner with U.S. President Donald Trump his wife Melania, and Robert Kraft (2nd-L), owner of the New England Patriots at Mar-a-Lago Club in Palm Beach, Florida U.S., February 10, 2017. REUTERS/Carlos Barria - RTSY4HX

U.S. President Donald Trump and First Lady Melania Trump greet a marching band as they arrive at Trump International Golf club to watch the Super Bowl LI between New England Patriots and Atlanta Falcons in West Palm Beach, Florida, U.S., February 5, 2017. REUTERS/Carlos Barria - RTX2ZQPW

Incoming U.S. first lady Melania Trump adjusts son Barron's tie as they attend the presidential inauguration of President-elect Donald Trump at the U.S. Capitol in Washington, U.S., January 20, 2017. REUTERS/Kevin Lamarque - RTSWJPK

U.S. President Donald Trump and first lady Melania Trump attend the Commander in Chief/Salute to Armed Forces Ball in honor of his inauguration in Washington, U.S. January 20, 2017. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY - RTSWMDY

First Lady Melania Trump arrives to welcome U.S. President Donald Trump (not pictured) at West Palm Beach International airport in West Palm Beach, Florida, U.S., February 3, 2017. REUTERS/Carlos Barria - RTX2ZK3B