Conservative columnist questions President Trump's mental stability after he ripped into London's mayor

President Donald Trump's seemingly ill-timed attack of London's Mayor Sadiq Khan is facing some serious backlash.

A conservative columnist for the Washington Post even wondered on Monday whether Trump is mentally stable.

"There are serious concerns about this president's mental stability and there are serious problems when you have a president of the United States who is so erratic, so unreliable," Jennifer Rubin said on CNN's 'New Day.' "This is incredibly damaging."

Trump doubled down on his Sunday morning criticism of the mayor saying there's "no reason to be alarmed."

On Monday he tweeted, "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!"

That's a bit of a misrepresentation of Khan, who had originally assured Britains they should not be alarmed to see a higher police presence following the attack.

"We will never let these cowards win, and we will never be cowed by terrorism," he said.

RELATED: Police response to London attacks

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Police respond to report of incidents at London Bridge
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Police respond to report of incidents at London Bridge
People leave the area with their hands up after an incident near London Bridge in London, Britain June 4, 2017. REUTERS/Neil Hall TPX IMAGES OF THE DAY
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay TPX IMAGES OF THE DAY
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Police officers ni the road near Borough on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - JUNE 03: Counter-terrorism special forces are seen at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
People speak with a police officer after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
People leave the area after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Neil Hall
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident near London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Members of the public leave the area at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Police officers clear the area near Borough market at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 03: Armed policeprep up in Borough on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Carl Court/Getty Images)
Police officers get changed as they attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
People speak with a police officer after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
Women embrace after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Hannah Mckay
People react as police attend to an incident near London Bridge in London, Britain, June 4, 2017. REUTERS/Hannah McKay
A photograph taken on a mobile phone shows British police cars blocking the entrance to London Bridge, in central London on June 3, 2017, following an incident on the bridge. Police are dealing with a 'major incident' on London Bridge, Transport for London said on Saturday, after witnesses reported seeing a van mounting the pavement and hitting pedestrians. / AFP PHOTO / Daniel SORABJI (Photo credit should read DANIEL SORABJI/AFP/Getty Images)
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
People leave the area after an incident near London Bridge in London, Britain June 4, 2017 REUTERS/Neil Hall
Police attend to an incident near London Bridge in London, Britain, June 3, 2017. REUTERS/Hannah McKay
Police attend to an incident on London Bridge in London, Britain, June 3, 2017. Reuters / Hannah McKay
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 03: Counter-terrorism special forces are seen at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 3 : Police officers cordon off the area around London Bridge, central London, after reports of pedestrians being hit by a white van on London Bridge in London, United Kingdom on June 3, 2017. UK Police said Saturday they were responding to two incidents on London Bridge and Borough Market amid reports of a van mowing down pedestrians. (Photo by Isabel Infantes/Anadolu Agency/Getty Images)
LONDON, ENGLAND - JUNE 03: A police officer escorts members of the public to safety at London Bridge on June 3, 2017 in London, England. Police have responded to reports of a van hitting pedestrians on London Bridge in central London. (Photo by Dan Kitwood/Getty Images)
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Rubin says Trump's picking a fight at the wrong time.

"Tthe problem is that we have a president who is not focused on the right things, who created controversy, who has taken the worst possible opportunity to attack the mayor of a city that has been attacked by terrorists," she said.

A spokesman for Khan has responded to the tweet saying, "he has more important things to do than to respond to Donald Trump's ill-informed tweet that deliberately takes out of context his remarks."

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