The US president called the former head of state his brother and friend.
On Wednesday, the current US President Joe Biden congratulated the former head of state Barack Obama (2009 – 2017), on his 60th birthday.
“Happy birthday, Barack Obama. I am proud to call you a brother and a friend. And I am grateful for your selfless service to this country,” Biden wrote on Twitter. He attached a joint photo to the post.
In the Obama administration, Biden served as vice president.