Yes, they are. But before I go into that, I just want to address something important. Is Iran democratic? It's something of a talking point within both the anti-neocon Left and the isolationist Right that Iran is actually a democratic country, which has never been the aggressor against another State (despite the fact they are responsible for numerous insurgencies in the region) and is constantly subjected to humiliating or otherwise undesirable Western policies.

So allow me to just address the point of Iran's democratic virtues: the unelected Guardian Council vets all parliamentary candidates before allowing them to stand, and there has been a startling decrease in the number of moderate reformists in the past decade or so. 2,500 hundred reformists in 2004 to 1,700 in 2008 and again the Guardian Council stalled progress by refusing many moderates the chance to stand in the 2009 Presidential elections. But, of course, does any of that really matter even when the Supreme Leader gets his way against the successful, vetted candidates regardless? Iran is no true democracy.

Now, to move on to whether Iran is a threat in any significant capacity. The 2007 National Intelligence Estimate argued that Iran had shifted gear with regards to its nuclear weapons programme back in 2003, much the same way Libya had done, confirming MI6's expectations of a shift in attitude in the region towards nuclear weapons development. However, it didn't last. The 2011 NIE reached a different conclusion, finding that the Iranian approach to nuclear weapons had indeed changed since the 2007 report, and that Iran was pursuing "early-stage R&D work on aspects of the manufacturing process for a nuclear weapon."

The IAEA also stated such concerns back in 2011, which includes evidence of a potential military application, and stated that Iran was not cooperating with the UN watchdog. . . Of course, not for the first time. There was also a report that same year, by the UNSC, which confirmed that Iran had avoided international sanctions by using a network of smugglers to acquire the materials needed for ICBMs and nuclear weaponry.

German spies have also played a hand in refuting the 2007 NIE report and confirming that yes Iran does have ambitions for a nuclear weapon. The French, similarly, say they are certain this is what the Iranians desire and the British are also convinced.

And, perhaps most damingly:

The report, by the London-based International Institute for Strategic Studies (IISS), said that Iran’s ambition to produce a nuclear weapon is β€œbeyond reasonable doubt” and that it has sufficient low-enriched uranium from its Natanz enrichment facility to produce one or two bombs.

It's important to note Iran does not currently have a nuclear weapons system, and it's probably the case that they aren't particularly close either. However, it's fairly clear at this point that nuclear armaments are a significant goal of the Iranian establishment and we ought to direct our intelligence services to disrupting them any way we can.

Don't we have the capability to check anything suspicious along with daily checks with the Iran Deal?

Which assumes Iran will comply with the terms. Going by their behaviour prior to the deal--and during the deal--I highly doubt it.

No, Iran isn't a democracy. It's under a dictatorship

theocratic oligarchy*

Yes, they are.

duh