"The suspension of Schengen rules will mean additional checks at Poland’s borders with the Czech Republic, Germany, Lithuania and Slovakia, and at all airports and seaports. A statement from Poland’s Ministry of Internal Affairs reads:
“The suspension of Schengen rules will mean additional checks at Poland’s borders with the Czech Republic, Germany, Lithuania and Slovakia, and at all airports and seaports.
A statement from Poland’s Ministry of Internal Affairs reads: “Polish Border Guards may prevent entry into Poland of anyone who may disrupt public order or pose a threat to security.””
See: Poland to Suspend Schengen During Warsaw Climate Change Conference (Krakow Post, link)