Some in the U.S. believe that tightening gun laws would prevent future mass shootings .
In the United States , support for gun law reform varies considerably by political party , with Democrats generally more supportive and Republicans generally more opposed .
Some in the United States believe that tightening gun laws would prevent future mass shootings .
In the United States , support for gun law reform varies considerably by political party , with Democrats generally more supportive and Republicans generally more opposed .