Some Americans saw the presidential candidacy of Barack Obama, who served as president of the United States from 2009 to 2017 and was the nation's first black president, as a sign that the nation had entered a new, post-racial era. The election of President Donald Trump in 2016, who was a chief proponent of the racist birther movement in the US (which argued that Obama was not born in the United States) and ran a racially tinged campaign, has been viewed by some commentators as a racist backlash against the election of Barack Obama. Before and after the election, Trump has had a history of speech and actions that have been widely viewed as racist or racially charged. During the mid-2010s, American society has seen a resurgence of high levels of racism and discrimination. One new phenomenon has been the rise of the "alt-right" movement: a white nationalist coalition which seeks the expulsion of sexual and racial minorities from the United States. Since the mid-2010s, the Department of Homeland Security and the Federal Bureau of Investigation have identified white supremacist violence as the leading threat of domestic terrorism in the United States.