evidence: WASHINGTON — President Joe Biden visited all three sites of the Sept. 11 attacks Saturday as the nation marked the 20th anniversary of that day. [...] Biden — who praised Bush's remarks about the nation's response to 9/11 as "a genuinely good speech about who we are" — was marking the milestone anniversary, his first as president, weeks after the Taliban's takeover of Afghanistan nearly two decades after the U.S. first knocked them from power in the wake of the Sept. 11 attacks. [...] At the 10-year mark, Obama also made stops at all three of the sites, speaking at ground zero. Biden, then vice president, spoke at the Pentagon of his empathy for those who lost loved ones that day.