TOP NEWS STORIES

1. Republican Rick Santorum complained bitterly Monday that a political action committee that supports presidential rival Mitt Romney is lying about his record.

2. After his narrow victory in Iowa and resounding win in New Hampshire, Mitt Romney may well be on his way to locking up the Republican nomination before the primary is even a month old.

3. An Iranian news website is reporting several suspects have been arrested over last week's killing of an Iranian nuclear scientist.