Trump and Melania host military families at the White House on July 4

President Donald Trump and First Lady Melania Trump arrive to welcome military families who have gathered for a Fourth of July picnic on the South Lawn of the White House prior to a fireworks display in Washington, US.

US President Donald Trump and First Lady Melania Trump walk down the stairs to greet guests  during the military families picnic at the White House in Washington, DC. (AFP)

US President Donald Trump sings the national anthem next to First Lady Melania Trump during the military families picnic at the White House in Washington. (AFP)

President Donald Trump delivers remarks as first lady Melania Trump looks on from the Truman Balcony. (AFP/Getty)

Photos: Reuters