By Richard Cowan WASHINGTON (Reuters) -Republicans in the U.S. House of Representatives on Thursday objected to a Democratic attempt to advance new limits on gun purchases as one Rebpublican legislator pulled out his handguns at a hearing to complain that they could be banned. The House Judiciary Committee met in an emergency session in the midst of a week-long Memorial Day recess as funerals were under way in Uvalde, Texas, for some of the 19 children and two teachers gunned down by an 18-year-old with an AR-15-style semiautomatic rifle last week. There were other mass shootings the week befo…