From the Saudi perspective, Tehran is building a nuclear weapon in a secret facility that is not and will not be on the map for inspections. They are also using the talks to lift the sanctions. Lastly, they are wreaking havoc in the Middle East and to Riyadh, Iran is worse than ISIS.
Since 2009, the Saudis have in various ways warned that if Iran crosses the line, they had access to nuclear missiles through a variety of sources. Importantly, Saudi Arabia has its own red-line threshold for Iran’s nuclear ambitions. At the time, these often off-the-wall comments were good enough for them to warn Tehran and later discourage them that should the P5+1 talks fail or the Iranians employ a strategy of deceit and duplicity, the Saudis will instantly have nuclear weapons from their ally Pakistan.
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