"Saudi has good relationships with Pakistan. They could just buy a weapon and again further destabilise the Middle East," Senator Ron Johnson told the CNN in an interview.
Tensions between Saudi Arabia, the main Sunni power, and Shiite-dominated Iran over Riyadh's execution of prominent Shiite cleric Sheikh Nimr al-Nimr have erupted this week into a full-blown diplomatic crisis, sparking widespread worries of regional instability.