Germany has introduced border checks along all nine borders to other EU countries. To understand how extreme these measures are perceived in an EU context, this is like if New York started treating all citizens of Connecticut, Massachusetts, New Jersey, Pennsylvania, and Vermont with suspicion and demanding to see papers for them to enter New York.
The populist government of Denmark tried this for years, leading to endless lines of cars at the border.
https://youtu.be/50rDPztFjOA?si=qtuuAkP9fzwmF_Ib
