If you mean did he act with the European Commission then say it.
Belgium also closed it's borders so did the Netherlands, they are Sovereign nations and can all close borders if they feel they have a reason.
Brussels is a City not an institution and why should we not protect ourselves, you were all quick of the mark to moan about people not being stopped from entering the UK. Now the boot is on the other foot you are still moaning.
Also remember each of those lorries is carrying freight out of the UK, if it does not reach it's destination it will be UK suppliers who will suffer. There are clauses in ever separate contract about this, as I said in a previous post my SIL is going to carry a heavy loss through this and be unable to furnish customers in the EU too.