WASHINGTON, Dec. 1 - The chairman of the Senate Armed Services Committee summoned top Pentagon officials to a closed-door session on Capitol Hill on Friday to explain a reported secret military campaign in Iraq to plant paid propaganda in the Iraqi news media. The White House also expressed deep concerns about the program.

Senior Pentagon officials said on Thursday that they had not yet received any explanation of the program from top generals in Iraq, including Gen. John P. Abizaid, Gen. George W. Casey Jr. and Lt. Gen. John R. Vines, the three most senior commanders for Iraqi operations.

After reports about the program circulated this week, General Casey initially protested that it should not be discussed publicly because it was classified.

One senior Pentagon official said, however, that General Casey was told that response was inadequate. The official asked for anonymity to avoid possible reprisals for disclosing the general's reaction.