open-door policy

noun2

1. •
   A policy or usual practice, by a person in authority, of permitting subordinates or constituents to visit his or her office unannounced and at any reasonable time for the purpose of discussing matters of concern.

   • She's a warm but no-nonsense administrator who has an open-door policy for all students. — 2001
2. •
   A governmental policy of encouraging immigration or of permitting increased access by foreigners for purposes of tourism, trade, investment, etc.

   • They also have tried to enlist support from the National Cattlemen's Association, on grounds this open-door policy could lead to easier entry for foreign beef. — 1984