This is cellphone video from an NBC cameraman after shots were reportedly heard near the U.S. Capitol Visitors Center.
Robert Liscouski, former assistant secretary at the Department of Homeland Security, discusses the law enforcement protocols and security responses to shooting attacks in Washington D.C.
Stephen Guilfoyle, Managing Director of Floor Operations at Deep Value, gives insight to the market reaction to news of the shooting of a police officer in Washington D.C.
CNBC's John Harwood reports from Washington D.C. after AP and Reuters reporting a police officer in Washington D.C. has been shot but is not seriously wounded. CNBC's Sue Herera gives details on the lockdown in the White House and shelter in place for Congress.
AP and Reuters reporting a police officer in Washington D.C. has been shot but is not seriously wounded and the shooter is in custody, reports CNBC's Sue Herera.
There have been shots reported fired at or around the U.S. Capitol's Visitors Center, and the Capitol Complex and the White House are in lock down, reports CNBC's Sue Herera.
There have been shots reported fired at or around the U.S. Capitol's Visitors Center, and the Capitol Complex and the White House are in lockdown, reports CNBC's Sue Herera.
Donald Trump needs to regain momentum and hit 1,237 before Cleveland or he could be headed back to Trump Tower for good, Politico's Ben White says.
California legislators and labor unions reached a tentative deal to raise the state's minimum wage from $10 to $15 an hour, a state senator said.
The attacks in Brussels will drive terrorism to the top of the campaign agenda and could give a boost to Donald Trump, Politico's Ben White says.
The dude behind the hit Broadway show about America's first Secretary of the Treasury is lobbying to keep him on the $10 bill.
The real question about Merrick Garland is whether the GOP's refusal to move forward will cost it in the election, Politico's Ben White says.
Tuesday's primaries left mainstream GOPers with hope that Donald Trump could still be stopped.
The Washington metro will shut down all day Wednesday in order to conduct an emergency equipment investigation.
Lyft will subsidize car rentals fees in some cities for drivers who do over 65 rides a week.
Tuesday could be the last stand for the "stop Trump" movement in the Republican Party. Politico's Ben White explains the stakes.
Bernie Sanders surprised the pollsters by beating Hillary Clinton in Michigan, but he still needs to win big in larger states ahead.
If Donald Trump wins Michigan Tuesday but John Kasich comes close, it'll suggest the trend away from Trump is real, Politico's Ben White says.
Donald Trump remains the GOP front-runner. But if he starts losing the biggest states and support, this thing isn't over, Politico's Ben White says.
As the GOP schism grows, Super Tuesday took us a step closer to a Donald Trump versus Hillary Clinton brawl for the White House.