After vowing solidarity with victims, President Donald Trump wrote on Twitter, “At least 7 dead and 48 wounded in terror attack and Mayor of London says there is ‘no reason to be alarmed!’” | Getty De Blasio: 'I don’t understand' why Trump is 'trying to undermine' London's mayor

Mayor Bill de Blasio said Monday that President Donald Trump’s Twitter criticism of the mayor of London undermines an exemplary leader and suggested the president's response to the weekend's terror attack in London was spawned by his inexperience in security matters.

Following deadly terrorist attacks Saturday in London Bridge and Borough Market, London Mayor Sadiq Khan told the BBC, in part, "Londoners will see an increased police presence today and over the course of the next few days. No reason to be alarmed. One of the things the police, all of us, need to do is make sure we’re as safe as we possibly can be. I’m reassured that we are one of the safest global cities in the world.”


After vowing solidarity with victims, Trump wrote on Twitter, “At least 7 dead and 48 wounded in terror attack and Mayor of London says there is ‘no reason to be alarmed!’”

Trump also used the recent attacks to advocate for his proposed ban on immigrants from several majority-Muslim countries, which federal courts have repeatedly blocked.

De Blasio defended Khan to reporters at an unrelated event in Manhattan Monday.

“He is telling people that they can be assured that the security forces will be reinforced, will be present, will be visible. That’s exactly what a leader is supposed to do. I don’t understand why Donald Trump is trying to undermine a man who is trying to protect the people of London.”

De Blasio, a Democrat seeking re-election later this year, went on to say, “It’s something I say regularly, [NYPD] Commissioner [James] O’Neill says regularly, any good leader would say. Maybe Donald Trump doesn’t have a lot of experience handling security situations, but it just makes no sense. It’s not fair to Mayor Khan, it’s not fair to the people of London.”