At least 22 of the 51 victims of the suicide bomb attack at a Turkish wedding were under the age of 14.
The attack, which took place in the city of Gaziantep, is suspected to have been carried out by a suicide bomber aged between 12 and 14 with links to so-called Islamic State.
It is the latest in a surge of violence this week in Turkey's mainly Kurdish southeast.
The White House said on Sunday that it condemns the attack on a wedding in Turkey, and that Vice President would discuss terrorism during his trip to Turkey this week.
Ned Price, spokesman for the White House National Security Council said: "The perpetrators of this barbaric act cynically and cowardly targeted a wedding, killing dozens and leaving scores wounded.
"Our thoughts and prayers go out to the families and loved ones of those killed, and we wish a speedy recovery to those injured.
"We stand with the people of Turkey as they defend their democracy in the face of all forms of terrorism."
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.