US President Barack Obama and Republican House Speaker John Boehner have blamed each other for the standoff over the federal debt crisis, as a deadline to avert a default looms. Obama condemned the Republicans' insistence on steep budget cuts and warned of a reckless outcome if the debt ceiling is not raised by Congress. Boehner responded by accusing the President of seeking a blank cheque.The US risks default without a deal to raise the borrowing limit by next Tuesday.The federal government runs a budget deficit that topped 1.5 trillion dollars this year, and has amassed a national debt of 14.3 trillion dollars.