U.S. park rangers look at the spot where Rev. Martin Luther King Jr. gave his famous "I Have a Dream" speech on the steps of the Lincoln Memorial in Washington, D.C., on Friday. Security threats have prompted officials to shut down the National Mall and much of downtown Washington, D.C. Samuel Corum/Getty Images hide caption
President-elect Joe Biden has tapped Dr. David Kessler, shown here during a briefing before the election, to be the White House's chief science officer of COVID Response. Drew Angerer/Getty Images hide caption
Army 1st Lt. Richard Collins III, left, and Sean Urbanski. Urbanski was sentenced Thursday to life in prison for the murder of Collins in May 2017. AP hide caption
Workers at the Amazon fulfillment center in Staten Island, N.Y., and across the U.S. have not been unionized. That could change in Alabama. Johannes Eisele/AFP via Getty Images hide caption
Pro-Trump supporters breeched security and stormed the U.S. Capitol on Jan. 6, 2021. Federal authorities as well as several local departments are looking into whether any off-duty officers were involved in the attack. Roberto Schmidt/AFP via Getty Images hide caption
Medical personnel prone a COVID-19 patient last November at Providence Holy Cross Medical Center in the Mission Hills section of Los Angeles. Jae C. Hong/AP hide caption
President-elect Joe Biden has released a $1.9 trillion proposal to help control the pandemic and bring economic relief to Americans. Matt Slocum/AP hide caption
Jacob Chansley, the "QAnon Shaman" known for his painted face and horned hat, was taken into custody in Arizona in connection with the assault on the U.S. Capitol on Jan 6. Saul Loeb/AFP via Getty Images hide caption
The Trump administration's decision to relax rules regarding the prescription of buprenorphine comes as record-level drug overdose deaths occurred in the U.S. in the 12 months ending in June 2020. Joe Raedle/Getty Images hide caption
Shoppers walk past a "Sale" sign outside a store at the Easton Town Center Mall in Columbus, Ohio, on Jan. 7. Luke Sharrett/Bloomberg via Getty Images hide caption
Enhanced security measures, among them razor wire atop a security fence surrounding the U.S. Capitol, are being implemented across the nation in preparation for next week's presidential inauguration. BRENDAN SMIALOWSKI/AFP via Getty Images hide caption
A fourth-grader eats breakfast at Mary L. Fonseca Elementary School in Fall River, Mass. Jessica Rinaldi/The Boston Globe via Getty Images hide caption
On April 3, 1968, Rev. Martin Luther King Jr., second from right, stands with other civil rights leaders on the balcony of the Lorraine Motel in Memphis, Tenn., a day before he was assassinated at approximately the same place. From left: Hosea Williams, Jesse Jackson, King and Ralph Abernathy. Charles Kelly/AP Photo hide caption
Convinced the election was stolen, thousands of Trump supporters storm the U.S. Capitol building on Jan. 6 as Congress counts and certifies the Electoral College vote. Spencer Platt/Getty Images hide caption
Corey Johnson was executed by lethal injection at the Terre Haute, Ind. federal prison Thursday night. He is the 12th inmate there to be executed since July under the Trump administration. Michael Conroy/AP hide caption
Then-Attorney General Jeff Sessions visits California in April 2017. Department of Justice Inspector General Michael Horowitz has released a critical review of Sessions' 2018 zero tolerance policy on people trying to cross the Southwest border. Sandy Huffaker/Getty Images hide caption
In this image taken from video, former Michigan Gov. Rick Snyder, left, with his lawyer, Brian Lennon, leave Genesee County Court in Flint, Mich., after a initial court appearance via Zoom on two misdemeanor counts of willful neglect of duty in connection to the Flint water crisis. Corey Williams/AP hide caption
Before he died, Brandon Cullins used these popsicle sticks to fight his urge to use drugs. Robert Watson hide caption
Researchers have found that a combination of two medications is effective at treating meth addiction. Daniel Kaesler/EyeEm/Getty Images hide caption
Colleagues, family and friends attend the August funeral of Los Angeles police Officer Valentin Martinez, the agency's first sworn officer to die of complications from COVID-19. Al Seib/Los Angeles Times via Getty Images hide caption
Patches is reunited with Norm Borgatello, her late owner's partner, at the Animal Shelter Assistance Program in Santa Barbara County, Calif., on Dec. 31. Jillian Title/Animal Shelter Assistance Program via AP hide caption
A screenshot from the Jan. 6 U.S. Capitol insurrection allegedly shows gold medalist swimmer Klete Keller wearing an Olympic jacket. U.S. District Court hide caption
Dr. Mona Hanna-Attisha, who was among the first to raise a red flag over the contamination of the water in Flint, Mich., says the filing of charges against former Gov. Rick Snyder "helps the city and the people move on and recover." Paul Sancya/AP hide caption
Shouting protesters face NYPD officers during a Black Lives Matter demonstration last summer in New York City, in outrage over the death of a Black man in Minnesota who died after a white policeman knelt on his neck for several minutes. Johannes Eisele/AFP via Getty Images hide caption