Overseas, about 5,000 to 7,000 people suspected of terrorist ties are monitored at one time, according to those officials.
Officials explained that the lower threshold had allowed the government to monitor far more people for possible terrorist ties than in the past.
He was never charged with any terrorist ties.
A renewed debate over Saddam Hussein's weapons and terrorist ties could raise the president's standing.
As detail after detail emerged unofficially, there were no reports of terrorist ties, officials said.
Some investigators reportedly said they had all but eliminated terrorist ties or political ideologies as a motive.
Some are indeed charged with serious crimes, including about two dozen linked to Al Qaeda or said to have other terrorist ties.
It found that few of the 762 illegal immigrants arrested in the government's investigation of Sept. 11 had clear terrorist ties.
Iraq is a country that has got terrorist ties.
Several investigations have criticized the government's failure to put two of the hijackers on watch lists even after their terrorist ties became known.