France, May 8 -- Paris told the European Commission last week it would maintain border checks for another six months - a measure allowed under Schengen freedom of movement rules in the case of serious threats to public order or internal security, but that is meant to be temporary.

France's controls have been renewed every six months since the November 2015 attacks.

The government cites "serious and persistent threats" including jihadist terrorism, anti-Semitic attacks, criminal networks linked to undocumented migration, tensions in the Pas-de-Calais linked to migration, and a worsening global security context from Iran and Afghanistan to Somalia and Ukraine.

It also points to the upcoming G7 summit in Evian, on the Swiss border.

Under...