President Donald Trump on Monday seized on the London terror attack to demand the US ban on travelers from some Muslim countries be reinstated, sparking a diplomatic row with Britain and jeopardizing his legal defense of the measure in the process.

U.S. President Donald Trump accused London Mayor Sadiq Khan on Monday of making a “pathetic excuse” over one of his comments in the wake of the attack that killed seven people in London.

The U.S. threatened to withdraw from the UN Human Rights Council unless reforms are ushered in including the removal of what it sees as an “anti-Israel bias”, diplomats and activists said.

Donald Trump lashed out Sunday at London’s mayor Sadiq Khan, accusing him of downplaying the threat of terrorism a day after knife-wielding men mowed down and stabbed revelers in the British capital.

President Donald Trump has called for vigilance and what he termed “extra level of safety” following the multiple terrorist attacks in London on Saturday night.