Cory Booker, the Democratic US senator from New Jersey, has embarked on a marathon speech on the Senate floor to warn of what he called the “grave and urgent” danger that Donald Trump’s presidential administration poses to democracy and the American people. Booker began his speech at 7pm on Monday night and passed the 23-hour mark with barely a break in speaking at 6pm on Tuesday evening. “I rise with the intention of disrupting the normal business of the United States Senate for as long as I am physically able,” Booker said near the start of his speech. “I rise