<P> He finds new rivals in Tusk, who seeks to maintain his position as Walker's right - hand adviser against Underwood's intrusion, and his former communications director, Remy Danton (Mahershala Ali), who is now a lobbyist working with Tusk . </P> <P> At the beginning of the season, Underwood is trying to erase all links to Russo's death . Thus, he kills Barnes by shoving her in front of an oncoming Washington Metro train, and frames her colleague and lover Lucas Goodwin (Sebastian Arcelus) for cyberterrorism . Another early task for newly promoted Underwood is finding his own replacement as House Majority Whip . He supports Jacqueline Sharp (Molly Parker), a military veteran and third - term Representative from California, although he refrains from offering public backing . </P> <P> Toward the end of the season, Underwood orchestrates Walker's downfall . He secretly leaks the details of the money laundering, for which Walker is blamed . While publicly supporting Walker, Underwood works behind the scenes to have him impeached, with Sharp's help . In the season finale, "Chapter 26", Walker resigns, and Underwood succeeds him as President of the United States . </P> <P> Season 3 begins with Underwood's presidency off to a rocky start: six months into his term, he is unpopular with the public, and Congress is blocking his attempts to move legislation forward . He plans to secure his legacy with an ambitious jobs bill, America Works, but the Democratic Congressional leadership refuses to support it; they also tell him that they will not support him if he seeks the presidential nomination in the next election . He nominates Claire for United States Ambassador to the United Nations, but her nomination is defeated after she makes a gaffe during a Senate nomination hearing . </P>

When does frank become president in house of cards