A bipartisan group of US senators on Sunday proposed steps to curb gun violence following devastating mass shootings in Texas and New York, but the limited measures fall far short of the president’s calls for change. The shootings in May – one at a Texas elementary school that killed 19 young children and two teachers, and another at a New York supermarket that left 10 Black people dead – have piled pressure on politicians to take action. But Republicans lawmakers, who have repeatedly blocked tougher measures, are still resisting major changes to gun regulations, instead pointing to mental hea…