President Biden's two German shepherd dogs are reportedly back at the family home in Delaware after an "incident" at the White House.
© ReutersMajor is said to behave in an agitated fashion
The younger of the two, Major, who is three years old, showed aggressive behaviour, US media reported.
Major - about 10 years younger than Champ - was involved in a "biting incident" with White House security, CNN said.
© ReutersFirst Lady Jill Biden with Champ after he arrived at the White House in January
The condition of any possible victim is unknown.
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Major has been known to behave in an agitated fashion, jumping, barking, and charging at staff and security, CNN reported.
There has been no official comment, but NBC said it is typical for Major and Champ to be in Delaware when First Lady Jill Biden is travelling, as she is at the moment.
© OtherThe Bidens are the first family to bring a rescue dog to the White House. Pic: bidendogs Instagram
Dr Biden is in Washington state, touring military bases and meeting service families.
While appearing on the Kelly Clarkson show last month, Mrs Biden said the dogs have to use a lift at the White House and "they're not used to that".
She added: "And they have to go out on the South Lawn with lots of people watching them."