Barack Obama's offhand approach to Gordon Brown's Washington visit last week came about because the president has facing exhaustion over America's economic crisis and is unable to focus on foreign affairs, the Sunday Telegraph has been told. Sources close to the White House say Mr Obama and his staff have been "overwhelmed" by the economic meltdown and have voiced concerns that the new president is not getting enough rest. British officials, meanwhile, admit that the White House and US State Department staff were utterly bemused by complaints that the Prime Minister should have been granted full-blown press conference and a...