<P> The series was renewed for a second season on May 11, 2017, which premiered on September 27, 2017 . </P> <P> On the night of the State of the Union speech, an explosion claims the lives of the President and everyone in the line of succession except for Secretary of Housing and Urban Development Thomas Kirkman, who had been named the designated survivor . Kirkman is immediately sworn in as President, unaware that the attack is just the beginning of what is to come . </P> <Ul> <Li> Kiefer Sutherland as Thomas "Tom" Kirkman (season 1 - present), the President of the United States and the former Secretary of Housing and Urban Development, who is sworn in following an unprecedented attack . </Li> <Li> Natascha McElhone as Alexandra "Alex" Kirkman (season 1 - 2), Tom's devoted wife and a former immigration lawyer, who finds herself thrust into a role she was not prepared to take on . </Li> <Li> Adan Canto as Aaron Shore (season 1 - present), the White House Deputy Chief of Staff, who becomes Chief of Staff in the days following the bombing; he resigns after being interrogated about the attack . He works as an aide to Speaker of the House Kimble Hookstraten before returning to the White House as Tom's National Security Advisor . </Li> <Li> Italia Ricci as Emily Rhodes (season 1 - present), Tom's Chief of Staff from his days as HUD Secretary, who becomes his Special Advisor and, following Aaron's resignation, his Chief of Staff . </Li> <Li> LaMonica Garrett as Mike Ritter (season 1 - present), a Secret Service agent originally assigned to Tom's personal security detail, who tries to ensure the Kirkman family's safety following the bombing . </Li> <Li> Tanner Buchanan as Leo Kirkman (season 1; recurring season 2), Tom's teenaged son, who does everything he can to support his little sister, but struggles to keep it together after a shocking secret about his past comes to light . </Li> <Li> Kal Penn as Seth Wright (season 1 - present), a speechwriter who initially harbors doubts about Tom's abilities to lead the country but quickly becomes one of his closest advisors and the new White House Press Secretary . </Li> <Li> Maggie Q as Hannah Wells (season 1 - present), an FBI agent assigned to investigate the events surrounding the bombing who suspects that the people responsible are not yet finished with what they started . </Li> <Li> Paulo Costanzo as White House Political Director Lyor Boone (season 2 - present), a highly skilled yet socially inept political consultant hired to help develop the Kirkman administration's political strategy . </Li> <Li> Zoe McLellan as White House Counsel Kendra Daynes (season 2 - present) </Li> <Li> Ben Lawson as Damian Rennett (season 2 - present), an MI6 agent assigned to find the bombing's chief architect who develops a competitive relationship with Wells . </Li> </Ul> <Li> Kiefer Sutherland as Thomas "Tom" Kirkman (season 1 - present), the President of the United States and the former Secretary of Housing and Urban Development, who is sworn in following an unprecedented attack . </Li>

Who plays the president's son on designated survivor