NEW : Pope tells bishops abuse of children was `` gravely immoral behavior '' Pope , president discuss Middle East , Middle East , says Marine Corps . The centerpiece of the trip 's Washington leg will be Thursday 's Mass at Nationals Park , a new baseball stadium where 46,000 people will gather to see the pope . Six-day , two -city visit to New York marks Benedict XVI Benedict XVI 's first as pope . Pope will celebrate Mass at stadium Six-day , travel to New York on Friday .
NEW : Pope tells bishops abuse of children was `` gravely immoral behavior '' Pope , president discuss Middle East , Middle East , says Marine Corps . Six-day , two -city visit to New York marks Benedict XVI Benedict XVI 's first as pope . Pope will celebrate Mass at stadium Six-day , travel to New York on Friday .