Join filmmaker Roland Emmerich ("2012," "Independence Day") in conversation about his new film, "White House Down." The action thriller stars Channing Tatum as policeman John Cale, who’s been denied a job with the Secret Service protecting President James Sawyer (Jamie Foxx). Cale is on a tour of the White House with his daughter when a heavily armed paramilitary group invades the complex. Now it’s up to Cale to save the president, his daughter, and the country.