US President Donald J. Trump (2L), Polish President Andrzej Duda (L), Polish First Lady Agata Kornhauser-Duda (2R) and First Lady Melania Trump (obscured) walk along the Colonnade at the White House in Washington, DC, USA, 12 June 2019. During the visit President Trump and President Duda will participate in a signing ceremony to increase military to military cooperation including the purchase of F-35 fighter jets and an increased US troop presence in Poland.