1) the cost of federal spending increases agreed to earlier this year
"More than half of the increase in the higher deficit forecast resulted from federal spending increases approved earlier this year. Both parties chafed against spending caps set in law as part of a 2011 deficit reduction agreement, and they reached a new deal in February to loosen those curbs."
2) higher interest payments
"The White House also revised up its projections of interest rates this year and next, which together with the funding boost increased projected interest payments on the public debt. The White House now expects yields on the 10-year Treasury note will average 3% this year, up from 2.6% in February, and 3.2% next year, up from 3%. "
