President Donald Trump sparked fury, in London and yet another pointed rebuke from Prime Minister Theresa May on Friday after he claimed that "loser terrorists" were behind a botched train attack were known to British police.
"Another attack in London by a loser terrorist", Trump tweeted.
Trump's travel ban blocked the entry of citizens from six Muslim-majority countries for 90 days and all refugees for 120 days.
Trump's latest comments were described as "unhelpful" by London's Metropolitan Police, as well as by Nick Timothy, May's former chief of staff.
The President did share highly classified intelligence about suspected IS plans, until then closely guarded among U.S. allies, with the Russian foreign minister during a meeting at the White House.
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In the explosion, 22 people were injured. He added. "The internet is their main recruitment tool which we must cut off & use better!"
During the last attack in London, Trump criticised Mayor Sadiq Khan for urging his constituents to remain calm. And, he said, his administration was doing more to combat ISIS than the Obama White House.
The president's intervention threatened to place fresh strain on the US-UK intelligence-sharing relationship, which has come under pressure a number of times since he entered the White House.
Trump concluded, "Must be proactive & nasty!"
At an event at Joint Base Andrews in Maryland, Trump said he offered prayers for London and said "radical Islamic terrorism it will be eradicated, believe me". "We need the Travel Ban as an extra level of safety!"
A senior US government official cast doubt on whether Trump was privy to information over whether the bomber in the west London attack was known or not.
The Supreme Court is scheduled to hear arguments on whether the travel ban is legal on October 10.