17 September, 2017
Although he confirmed he had been briefed on London, the President did not say whether that briefing happened before or after his tweets.
Assistant Commissioner Mark Rowley of the Metropolitan Police, a top counterterrorism official, said at a news conference that the bomb was "an improvised explosive device", and he urged anyone who had seen what happened, or had taken photos or videos of the incident, to come forward.
Mr. Trump also tweeted that his administration had already "made more progress" against the Islamic State than President Barack Obama's administration had in eight years. "Must be proactive!" Trump said in one tweet.
He added: "The travel ban into the United States should be far larger, tougher and more specific - but stupidly, that would not be politically correct!" He criticized the mayor of London, Sadiq Khan, for two days after a deadly knife and van attack in June.
This isn't the first time Trump has chimed in quickly after a terrorist attack in Britain since coming into office. "Must be proactive!" he wrote in his first tweet.More news: Family die after falling into volcanic crater in Italy
Meanwhile, the USA president on Friday claimed his administration had "made more progress in the last nine months" against the Daesh (ISIL) terrorist group than his predecessor, Barack Obama.
"I am sickened by the terrorist attack in London and am praying for the victims".
"Loser terrorists must be dealt with in a much tougher manner.The internet is their main recruitment tool which we must cut off & use better!" he continued.
But the high court justices allowed the ban to go into effect last month while the case is pending.
The version of the ban permitted by the Supreme Court is Trump's second pass at the policy, which originally banned residents of seven Muslim-majority countries.
It's unclear, though, what will be left for the court to decide.