President Donald Trump said early Thursday he will sign a trade deal with Britain that will be America's first since he announced sweeping global tariffs that have hammered markets and threaten to upend the global economy. "This should be a very big and exciting day for the United States of America and the United Kingdom," he said in a Truth Social post, adding that there would be a news conference in the Oval Office at 10 a.m. ET. In a subsequent post, Trump said the...