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A security guard of U.S. first lady Michelle Obama stands beside a man wearing a Chinese ancient warrior costume during Obama's visit at the City Wall on March 24, 2014 in Xi'an, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 480292485 )

First Lady Michelle Obama (Center) with her daughters Malia Obama and Sasha Obama, mother Marian Robinson visit the Xi'an City Wall on March 24, 2014 in Xi'an, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 480271453 )

First Lady Michelle Obama watches students performing Tai Chi during her visit to Chengdu No.7 High School on March 25, 2014 in Chengdu, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 480414595 )

U.S. first lady Michelle Obama, center, watches a man flying a kite as she visits an ancient city wall with her daughters and her mother in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan) ( China Michelle Obama )

First Lady Michelle Obama with her daughters Malia Obama and Sasha Obama, mother Marian Robinson visit Museum of Terracotta Warriors during a visit to the historic excavation site on March 24, 2014 in Xi'an, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 480265367 )

U.S. first lady Michelle Obama, right, chats with students after practicing tai chi with them at Chengdu No.7 High School in Chengdu in southwest China's Sichuan province Tuesday, March 25, 2014. (AP Photo/Andy Wong) ( China Michelle Obama )

US First Lady Michelle Obama plays table tennis as Peng Liyuan (R), wife of Chinese President Xi Jinping, looks on during their visit to the Beijing Normal School, a school that prepares students to attend university abroad in Beijing on March 21, 2014. Michelle Obama arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (ANDY WONG/AFP/Getty Images) ( 528246730 )

U.S. security officer prepares for First Lady Michelle Obama's visit to the Forbidden City on March 21, 2014 in Beijing, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 479848985 )

First Lady Michelle Obama with her mother Marian Robinson, daughters Sasha Obama and Malia Obama arrives at Beijing Capital International Airport on March 20, 2014 in Beijing, China. The first lady arrived in Beijing with her mother, Marian Robinson, and daughters to kick off a six-day tour where she will focus on education and cultural exchange. (Photo by Feng Li/Getty Images) ( 479699385 )

U.S. First Lady Michelle Obama dip a brush in an ink pod as she tries out writing Chinese characters as Peng Liyuan, wife of Chinese President Xi Jinping, left, watches her during their visit in a Chinese traditional calligraphy class at the Beijing Normal School, a school that prepares students to go abroad in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool) ( China Michelle Obama )

U.S. First Lady Michelle Obama (Right) visits the Forbidden City accompanied by Peng Liyuan (2nd Right), wife of Chinese President Xi Jinping on March 21, 2014 in Beijing, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 479841777 )

A Chinese security officer holds a police line rope during U.S. First Lady Michelle Obama's visit to the Forbidden City on March 21, 2014 in Beijing, China. Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges. (Photo by Feng Li/Getty Images) ( 479848937 )

U.S. First Lady Michelle Obama, her daughters Sasha (L) and Malia (2ndL) and U.S. Ambassador to China Max Baucus (3rdL) meet with Chinese President Xi Jinping and his wife Peng Liyuan (R) during a meeting at the Diaoyutai State guest house on March 21, 2014 in Beijing, China. (Photo by Andy Wong-Pool/Getty Images) ( 479871089 )

U.S. First Lady Michelle Obama, center, her daughters Malia, left, and Sasha, second from left, is accompanied by Peng Liyuan, wife of Chinese President Xi Jinping, third from right, watch students demonstrating remote control mechanical robots at the Beijing Normal School, a school that prepares students to attend universities abroad in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool) ( China Michelle Obama )

U.S. First Lady Michelle Obama, right, is greeted by Max Baucus, center, the new U.S. Ambassador to China, and his wife Melodee Hanes, left, upon her arrival at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool) ( China Michelle Obama )

A Chinese paramilitary policeman, back, a U.S. secret service officer, front, as they guard a tarmac before the landing of a plane carrying U.S. First Lady Michelle Obama, her daughters and her mother, arrive at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool) ( China Michelle Obama )