NEW : Since the Newtown attack by a lone gunman , Connecticut and a few other states have passed tougher gun laws . Sen. Ryan wants a vote on background checks unlikely until later in the week . A constitutional amendment on background checks comes up this week . Republicans who voted to open debate may not support the amendment . Debate on the overall reform package is expected to last two weeks .
NEW : Sen. Ryan wants a vote on background checks unlikely until later in the week . A constitutional amendment on background checks comes up this week . Republicans who voted to open debate may not support the amendment . Debate on the overall reform package is expected to last two weeks .