Under current law, all male U.S. citizens between 18 and 25 (inclusive) years of age are required to register within 30 days of their 18th birthday. In addition, certain categories of non-US citizen men between 18 and 25 living in the United States must register, particularly permanent residents, refugees, asylum seekers, and illegal immigrants. Foreign men lawfully present in the United States who are non-immigrants, such as international students, visitors, and diplomats, are not required to register, so long as they remain in that status. If an alien's non-immigrant status lapses while he is in the United States, he will be required to register. Failure to register as required is grounds for denying a petition for U.S. citizenship. Currently, citizens who are as young as 17 years and 3 months old can pre-register so when they turn 18 their information will automatically be added into the system.