WASHINGTON - Republican presidential candidate Newt Gingrich will lay off about a third of his campaign staff and is scaling back his schedule to focus on a strategy for the party's nominating convention, a campaign aide confirmed on Tuesday.Politico first reported the moves in what aides to the former US House of Representatives speaker are calling a "big choice convention" strategy.Read the full story here."We're focusing exclusively on what it'll take to win what we're going to be calling a big-choice convention in August," Gingrich communications director Joe DeSantis told Politico earlier.Another campaign spokesman, R.C. Hammond, confirmed the report and said the changes were in no way a sign that Gingrich might be preparing to bring his presidential run to a close."It's quite the opposite," Hammond told Reuters. "It means Newt is designing the campaign to be ready to take the floor in Tampa."