Upon her departure from the Democratic Party to register as an Independent, Arizona Sen. Kyrsten Sinema's work with President Joe Biden was recognized by the White House as they expect to continue working with her.Kevin Dietsch/Getty Images Arizona Sen. Krysten Sinema announced Friday that she's leaving the Democratic Party to be an independent. Sinema said she is stepping away from a "broken partisan system." The White House said that even with Sinema's party change, it expects to keep working closely with her. Arizona Sen.