WASHINGTON -- U.S. spy agencies are considering whether to rewrite a controversial 2007 intelligence report that asserted Tehran halted its efforts to build nuclear weapons in 2003, current and former U.S. intelligence officials say.

The intelligence agencies' rethink comes as pressure is mounting on Capitol Hill, and among U.S. allies, for the Obama administration to redo the 2007 assessment, after a string of recent revelations about Tehran's nuclear program.

German,...