Trump said the concertgoers were "murdered by evil losers in life".
The terrorist attack happened around 10:33 pm local time at a concert hall in Manchester, England, where pop star Ariana Grande was concluding her concert. "I will call them losers from now on because that's what they are".
In his most recent remarks, Trump's acknowledgement that he will call them losers "from now on" is the key here.
"The terrorists and extremists and those who give them aid and comfort must be driven out from our society forever", the president said in Bethlehem on Tuesday, standing alongside Palestinian Authority President Mahmoud Abbas.
Trump declared he would not call the terrorists "monsters", a term he believes they would prefer, instead choosing "losers", a longtime favorite Trump insult. "They would think that's a great name", he said. And we'll have more of them. "We can not stand a moment longer for the slaughter of innocent people", he said. "It is a reality I'm afraid that London, New York, and other major cities around the world have got to be prepared for these sorts of things", Khan said. "Life must be protected".
On Tuesday, he added: "All civilized nations must join together to protect human life and the sacred right of our citizens to live in safety and in peace". We can not stand a moment longer for the slaughter of innocent people.
US First Lady Melania Trump also expressed sympathies for those affected by the attack. His speech, devoid of phrases like "radical Islamic terrorism" and just comparatively subtle made it sound like Trump now wants to work in conjunction with the Muslim world in fighting terrorism.
Trump's oldest daughter, Ivanka Trump, also paid tribute to the victims of the bombing.
United Nations Ambassador Nikki Haley said she was "deeply saddened to hear of the senseless attack" and said she would pray for the victims and their families.
The Manchester bombing killed 22 young people and injured more than 59.
British Prime Minister Theresa May said the bombing was a brutal but cowardly act of terror.