The U.S. Treasury is set to auction $25 billion of 30-year government bonds on Thursday, with the sale expected to deliver the highest borrowing cost since 2001. The offering comes as the government's interest expense in the current fiscal year through the end of September has already reached $1.17 trillion, up 15% from a year earlier. Congressional data cited in the report show U.S. debt increased by $2.25 trillion in the first year of Trump's second term and had climbed further to $3.16 trillion by July this year.