WASHINGTON, DC - MARCH 15: U.S. President Donald Trump (R) greets Angel Mom Mary Ann Mendoza (L) of Mesa Arizona, during an event on border security in the Oval Office of the White House March 15, 2019 in Washington, DC. President Trump has vetoed the congressional resolution that blocks his national emergency declaration on the southern border

WASHINGTON, DC – MARCH 15: U.S. President Donald Trump (R) greets Angel Mom Mary Ann Mendoza (L) of Mesa Arizona, during an event on border security in the Oval Office of the White House March 15, 2019 in Washington, DC. President Trump has vetoed the congressional resolution that blocks his national emergency declaration on the southern border