While waiting for the Supreme Court to rule on presidential immunity, let’s turn to President Grant and his horse and carriage. In 1872, Grant, then the 18th president, was, as the story goes, pulled over for speeding. The police officer, William Henry West, recalled that Grant resembled “a schoolboy who had been caught in a guilty act by his teacher.” Grant expressed his admiration for West, who’d appeared in arms in the war. West arrested him anyhow.