Several Terrorists overstayed VISAs to inflict murder and mayhem on the civilian population of the USA. The terrorists were aided by the Federal Governments refusal to enforce their VISA time limits. The US government has been slow walking computer programs designed to track and remove VISA overstays. Democrats have been aiding the job stealing of US citizens by foreign nationals by protecting the 40% of the illegal population that overstayed a VISA.
Any true immigration reform must include serious and enforced reform of the VISA system.