People who want to come to the U.S. from six majority-Muslim countries now face new rules as part of President Trump's travel ban took effect Thursday night.
Visa applicants and refugees from Syria, Sudan, Somalia, Libya, Iran and Yemen must prove a personal tie to someone already here.
The State Department defines a close family member as a parent, child, spouse, sibling, adult son or daughter, or son or daughter-in-law.
Business and professional ties are also accepted.
But the State Department says they must be "formal, documented and formed in the ordinary course rather than for the purpose of evading" the president's executive order.
The ban takes effect just days after the Supreme Court partially restored Trump's amended executive order.
The high court will hear arguments in the case this fall.
Immigration advocates are promising to have attorneys on standby at airports to assist people who need help with the new rules.