WATCH: President Trump attends unveiling ceremony of Berlin Wall memorials and NATO's Article 5

Update: This event has ended.

President Trump is set to attend the unveiling ceremony of Berlin Wall memorials and NATO's Article 5, which requires all member states to treat an attack against one as an attack against all.

RELATED: President Donald Trump's trip to Belgium

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President Donald Trump's trip to Belgium
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President Donald Trump's trip to Belgium
U.S. President Donald Trump and first lady Melania Trump arrive at the Brussels Airport, in Brussels, Belgium, May 24, 2017. REUTERS/Hannah McKay
U.S. President Donald Trump and first lady Melania Trump arrive at the Brussels Airport, in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump and Belgium's Prime Minister Charles Michel (R) review troops upon arriving at the Brussels Airport, in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump (R) and Belgium's Prime Minister Charles Michel review troops upon arriving at the Brussels Airport, in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst
First lady Melania Trump waves from the motorcade as she sits next to U.S. President Donald Trump at the Brussels Airport in Brussels, Belgium, May 24, 2017. REUTERS/Hannah McKay
Belgian troops stand at attention as U.S. President Donald Trump and first lady Melania Trump arrive at the Brussels Airport, in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump (2ndL) and first lady Melania Trump (R) pose with King Philippe and Queen Mathilde of Belgium at the Palace in Brussels, Belgium, May 24, 2017. REUTERS/Francois Lenoir
U.S. President Donald Trump (2ndL) and first lady Melania Trump (R) pose with King Philippe and Queen Mathilde of Belgium at the Palace in Brussels, Belgium, May 24, 2017. REUTERS/Francois Lenoir
U.S. President Donald Trump (R) walks with King Philippe of Belgium at the Palace in Brussels, Belgium, May 24, 2017. REUTERS/Francois Lenoir
U.S. President Donald Trump and his delegation meet Belgian Prime Minister Charles Michel in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst
(L-R) U.S. Secretary of State Rex Tillerson, President Donald Trump and National security adviser H.R. McMaster eat Belgian chocolate during their meeting with Belgian Prime Minister Charles Michel in Brussels, Belgium, May 24, 2017. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
European Council President Donald Tusk (L) speaks to US President Donald Trump (R) after welcoming him at EU headquarters, as part of the NATO meeting, in Brussels, on May 25, 2017. / AFP PHOTO / Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
U.S. President Donald Trump (R) walks with the President of the European Council Donald Tusk in Brussels, Belgium, May 25, 2017. REUTERS/Francois Lenoir
U.S. President Donald Trump (R) arrives for his meeting with President of the European Council Donald Tusk and European Commission President Jean-Claude Juncker (neither pictured) at the European Union headquarters in Brussels, Belgium May 25, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump (R) shakes hands with European Union foreign policy chief Federica Mogherini before their meeting at the European Union headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump (R) and the President of the European Council Donald Tusk take their seats before their meeting at the European Union headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump and first lady Melania Trump wait the arrival of French President Emmanuel Macron (unseen) before a lunch ahead of a NATO Summit in Brussels, Belgium, May 25, 2017. REUTERS/REUTERS/Jonathan Ernst
U.S. first lady Melania Trump greets French President Emmanuel Macron as President Donald Trump (C) looks on before a lunch ahead of a NATO Summit in Brussels, Belgium, May 25, 2017. REUTERS/REUTERS/Jonathan Ernst
U.S. President Donald Trump (L) and French President Emmanuel Macron shake hands before a lunch ahead of a NATO Summit in Brussels, Belgium, May 25, 2017. REUTERS/REUTERS/Jonathan Ernst
From L-R, Belgium's King Philippe, U.S. President Donald Trump, NATO Secretary General Jens Stoltenberg, German Chancellor Angela Merkel and Belgian's Prime Minister Charles Michel gather with NATO member leaders to pose for a family picture before the start of their summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann
U.S. President Donald Trump speaks beside NATO Secretary General Jens Stoltenberg at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017.REUTERS/Jonathan Ernst
U.S. President Donald Trump (L) and Britain's Prime Minister Theresa May react during a ceremony at the new NATO headquarters before the start of a summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY
NATO Secretary General Jens Stolenberg (L), U.S. President Donald Trump and Britain's Prime Minister Theresa May (R) attend a ceremony at the new NATO headquarters before the start of a summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann
NATO country leaders including U.S. President Donald Trump (L) Canada's Prime Minster Justin Trudeau (L Top) and Britain's Prime Minister Theresa May (R) react during an aerial fly-pass at the new NATO headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann
U.S President Donald Trump (C) follows Britain's Prime Minister Theresa May as NATO member leaders gather before the start of their summit in Brussels, Belgium, May 25, 2017. REUTERS/Hannibal Hanschke
U.S President Donald Trump (C) takes his place as NATO member leaders gather before the start of their summit in Brussels, Belgium, May 25, 2017. REUTERS/Hannibal Hanschke
U.S. President Donald Trump (C) is flanked by British Prime Minister Theresa May (L) and NATO Secretary General Jens Stoltenberg during in a working dinner meeting at the NATO headquarters during a NATO summit of heads of state and government in Brussels, Belgium, May 25, 2017. REUTERS/Matt Dunham/Pool
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