WASHINGTON, DC - JUNE 01:  U.S. President Donald Trump arrives to announce his decision to withdraw the United States from the Paris climate agreement in the Rose Garden at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015. The agreement is intended to encourage the reduction of greenhouse gas emissions in an effort to limit global warming to a manageable level.  (Photo by Win McNamee/Getty Images)
Trump tweets spark strong reaction in UK
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Story highlights

Trump and Khan have spent the last year sniping at one another

Khan has charged that Trump is bigoted

Washington CNN  — 

President Donald Trump’s decision to knock London Mayor Sadiq Khan on Monday didn’t come out of nowhere.

Trump and Khan have spent the last year sniping at one another, largely over Trump’s proposed travel ban that would temporarily bar some Muslims from entering the United States. Trump has used the policy, stalled now in US courts, as an example of the sort of toughness that he says Khan refuses to show amid terrorism attacks that are riling the United Kingdom.

Khan has pushed back, calling Trump bigoted and saying that he doesn’t need advice from the US President.

Here’s how we got here:

December 7, 2015

Republican presidential candidate Donald Trump speaks to guests gathered for a campaign event at Mississippi Valley Fairgrounds on December 5, 2015 in Davenport, Iowa.
Donald Trump: Bar all Muslims from entering the U.S.
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Trump, in the aftermath of an attack in San Bernardino, California, calls in a statement for a “total and complete shutdown of Muslims entering the United States until our country’s representatives can figure out what the hell is going on.”

May 5, 2016

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Sadiq Khan makes history in London's mayoral race
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Khan is elected as the first Muslim mayor of London.

May 9, 2016

Trump tells The New York Times that Khan could be allowed to enter the United States. “There will always be exceptions” to the ban, Trump says.

May 10, 2016

Khan tells BBC that he has no interest in Trump’s offer: “I don’t want to be the exception to be allowed to go to America.”

Britain's Labour party candidate for London Mayor Sadiq Khan arrives at City Hall in central London on May 6, 2016, as votes continue to be counted in the contest for the Mayor of London. 
London was poised to become the first EU capital with a Muslim mayor Friday as Sadiq Khan took the lead in elections that saw his opposition Labour party suffer nationwide setbacks. / AFP / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)
Trump slammed by London mayor
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May 11, 2016

Khan tells CNN’s Christiane Amanpour that Trump’s views of Islam “are ignorant.”

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London Mayor Sadiq Khan: 'I'm hoping' Trump doesn't win
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September 18, 2016

A day after bombings in New York and New Jersey, Khan tells The London Standard that attacks are “part and parcel” of life in major cities.

“It is a reality I’m afraid that London, New York, other major cities around the world have got to be prepared for these sorts of things,” he said.

March 22, 2017

Trump’s son, Donald Trump, Jr., resurfaces that September tweet after an attack at Westminster.

“You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan,” he tweeted.

March 23, 2017

The next day, Khan tells Amanpour that he isn’t going to reply to the President’s son.

“I’ve been doing far more important things over the last 24 hours,” he says.

sadiq khan cnn amanpour
London Mayor responds to Donald Trump Jr. tweet
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June 3, 2017

Attacks at the London Bridge and Borough Market kill seven and injure almost 50.

SOCO offficers on the London Bridge following last night's incident where six people were killed in a terror attack and three assailants were shot dead by police, on June 4, 2017. At least six people were killed in attacks late Saturday as a van mowed down pedestrians on London Bridge before attackers then stabbed victims at nearby Borough Market.
Police: 7 dead, dozens injured in attack
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June 4, 2017

Khan says that London residents should expect to see an intensified police presence in the wake of the attacks.

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“There’s no reason to be alarmed,” he says.

Trump then takes Khan’s remark out of context.

“At least 7 dead and 48 wounded in terror attack and Mayor of London says there is “no reason to be alarmed!’” Trump tweets.

A Khan spokesman replied: “He has more important things to do than respond to Donald Trump’s ill-informed tweet that deliberately takes out of context his remarks urging Londoners not to be alarmed when they saw more police - including armed officers - on the streets.”

June 5, 2017

Trump again hammers Khan, saying the mainstream media is abetting Khan’s timidity.

“Pathetic excuse by London Mayor Sadiq Khan who had to think fast on his “no reason to be alarmed” statement. MSM is working hard to sell it!”

Khan hits back later when asked by Britain’s Channel 4 News if he thought Trump’s state visit to the UK should be called off.

“I don’t think we should roll out the red carpet to the President of the USA in the circumstances where his policies go against everything we stand for,” Khan responded.

“When you have a special relationship it is no different from when you have got a close mate. You stand with them in times of adversity, but you call them out when they are wrong. And there are many things about which Donald Trump is wrong.”