lead u.s. senate democrats monday urge quick passage legislation defeat last year impose additional gun control wake weekend mass shoot florida four democratic senators lead chuck schumer new york senate democrat call immediate passage bill prevent people terror watch list suspect terrorists buy firearms explosives last december democrats attempt pass legislation block republicans say government could mistakenly place innocent people watch list new push legislation come man assault rifle enter gay nightclub orlando kill 49 people wound 53 others gunman subsequently kill law enforcement officer federal agents interview gunman twice recent years join schumer call passage legislation senators dianne feinstein california bill nelson florida richard blumenthal connecticut meanwhile democratic president barack obama monday blame weak gun laws allow disturb individuals gain access powerful weapons hillary clinton lead democratic candidate replace obama white house say people watch list bar buy gun say debate possible restrictions assault weapons donald trump presumptive republican presidential nominee take different approach repeat call temporarily ban muslims enter country orlando gunman bear unite state parent afghan immigrants senate democrats push new gun control measure