Federal health officials have called for a "pause" in the use of the Johnson & Johnson vaccine after reports that six women who got the vaccine developed blood clots afterward. Close to 7 million people have gotten this vaccine in the U.S. to date.

The Centers for Disease Control and Prevention says the blood clots are extremely rare but that it is reviewing the cases. The agency says it expects this pause to last for "a matter of days."

The U.S. intelligence community said Tuesday that it views four countries as posing the main national security challenges in the coming year: China, followed by Russia, Iran and North Korea.

"China increasingly is a near-peer competitor, challenging the United States in multiple arenas — especially economically, militarily, and technologically — and is pushing to change global norms," said the report released by the Office of the Director of National Intelligence.

President Biden will withdraw all remaining U.S. troops from Afghanistan by Sept. 11, the 20th anniversary of the terrorist attacks that prompted America's involvement in its longest war, a senior administration official told reporters on Tuesday.

Some 2,500 U.S. troops remain in Afghanistan, and as many as 1,000 more special operations forces are also reported to be in the country. There were more than 100,000 at the war's peak in 2011.

Former Minneapolis police officer Derek Chauvin's attorney called on Shawanda Hill to testify on Tuesday morning. Chauvin is on trial on murder and manslaughter charges in George Floyd's death.

Hill told the court she was at the Cup Foods store last May 25 when she ran into Floyd, whom she knew. She described his behavior as "happy, normal, talking, alert."

She said Floyd offered to give her a ride to her house, and she went with him to the car he was driving.