She said providing more firearms for London police would not be a sound solution to the increased tempo of terrorist attacks, saying the strategy of heavily armed, highly mobile specialty teams is effective. She said Britain will review its counterterrorism strategy.
Trump stated on Twitter Monday morning that Khan had offered a "pathetic excuse" and "had to think fast on his "no reason to be alarmed" statement".
The Trump administration last week formally asked the Supreme Court, the highest court in the US, to allow the ban to take effect, arguing that restricting immigration by refugees and visitors from Iran, Libya, Somalia, Sudan, Syria and Yemen is necessary to protect USA national security. May said the victims included a "number of nationalities", saying it was "an attack on the free world". The three attackers were shot dead by police after driving into pedestrians on London Bridge and stabbing people in Borough Market.
British police are continuing to investigate the incident and have released the identities of two suspects.
Seven people have been confirmed dead and 48 injured after the sickening attack.
"MSM (mainstream media) is working hard to sell it!"
Trump then claimed on Twitter that Khan had implied there was "no reason to be alarmed" by the attack itself, rather than the extra police officers.
"We grieve the loss of our handsome, loving daughter and sister who was 30 years old".
French Foreign Minister Jean-Yves Le Drian said a French citizen was also killed.
The latest attack comes against the backdrop of parliamentary elections later in the week. London Bridge train station also reopened.
Referring to Butt, Mr Rowley said one of the three was part of an investigation "prioritised in the lower echelons of our investigative work".
He said: "Today we mourn the loss of innocent lives".
Chartered accountant Usman Saifi, 36, of Putney, south west London, was among a group of Muslims who mingled with the crowd wear bold blue t-shirts which read I Am A Muslim Ask Me Anything.
On March 22, five people were killed in London after Khalid Masood rammed his auto into pedestrians on Westminster Bridge before fatally stabbing a policeman outside Parliament.
Two weeks ago, on May 22, a deadly blast occurred at the entrance to Manchester Arena at the end of United States singer Ariana Grande's concert, claiming the lives of at least 22 and injuring nearly 120 others.
In New York, WABC-TV's "Eyewitness News" reported that a college student from Brooklyn who attends Jesuit-run Boston College was at a pub with some of his classmates in London's Borough Market when terrorists came in with long knives and started attacking people.