Sadiq Khan said "It's for Donald Trump to answer the question why he's obsessed with me."
The president's favorite putdowns on Twitter function as a virtual Rorschach test for his own personality, traits and behavior
"We expect our president ... to represent all Americans with dignity with grace, and the president hasn't done that," former ambassador to NATO Nick Burns said.
Trump branded Sadiq Khan a "stone cold loser" before he even touched down to begin his state visit on Monday.
President and Sadiq Khan continue their feud as Trump arrives in U.K. for three-day state visit.
President Donald Trump and London Mayor Sadiq Khan have clashed repeatedly over a number of issues.
"It feels like the Mayor of London prioritizes personal enmity over the good of the country," the balloon's organizer said.
The president sent the British press into a frenzy with a controversial interview to begin his U.K. trip.
"I guess when they put out blimps to make me feel unwelcome, no reason for me to go to London," the president said.
"Breaking news: Trump Defeats Sadiq Khan in Balloon Wars," the image caption read.
The president will spend the vast majority of his time outside of London.
Trumpism puts the entire planet in jeopardy—it's vital that our resistance isn't restricted to one day.
"Moral outrage is water off a duck's back to Trump," a petition for Trump Baby said. "But he really seems to hate it when people make fun of him."
Sadiq Khan estimated that 40 percent of London's 10- and 11-year-olds were overweight or obese.
Scotland Yard have launched 55 murder investigations so far this year.
There's a Hanukkah boy band parody and Hanukkah versions of Ed Sheeran's "Castle on the Hill" and Andra Day's "Rise Up."
A poll in March found that 60 percent of the British public disapproved of Trump, while just 18 percent backed him.
"You should be celebrated and respected and embraced," Sadiq Khan said at a reception for the LGBT community ahead of the weekend's march.
Sadiq Khan has called on the British government to cancel Trump's visit later this year.
Asked about the president's response to Saturday's attack in London, Conway said reporters were trying to "make this about something other than what it's about."
Trump tweeted: "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'"
Wes Streeting, a London MP, said Trump Jr. was a "disgrace" for using the attack for "political gain."