Longer-dated Treasury yields gained while the dollar broadly eased on Monday amid concerns about the U.S. debt load and a tax-cut bill, following Moody's downgrade of the country's sovereign credit rating.

U.S. stocks, bonds and the value of the U.S. dollar are drifting lower on Monday following the latest reminder that the U.S government seems to be hurtling toward an unsustainable mountain of debt. Moody’s pointed to how the U.