Apple aims to bolster lineup with new iPhone

New iPhone and iPad models likely to be unveiled Monday are aimed at helping Apple keep momentum in the fast-evolving mobile device market. The media gathering at the company's intimate Town Hall auditorium in Silicon Valley will also give Apple a chance to restate its case for fighting a US government demand that it break into an attacker's iPhone. Apple is widely expected to release a small-screen iPhone to encourage replacement of the 5S and 5C models, which have four-inch displays.