Avril Haines: US intelligence chief intervenes to block state secrets in Saudi Crown Prince's feud with former Saudi official

Avril Haines: US intelligence chief intervenes to block state secrets in Saudi Crown Prince's feud with former Saudi official: The US Director of National Intelligence has made an extraordinary intervention in a federal court case brought against a top former Saudi intelligence official, invoking the rarely used state secrets privilege to stop classified information from coming out that could cause "exceptionally grave" harm to US national security.