At the moment Iran and its proxies are actively threatening the US and its allies. Stopping that will be a prerequisite for any lobbying attempt.
Let's drop the farcical argument about how the Iranian programme is a threat to US interests. Meanwhile the tiny UAE can actively buy nuclear tech from the US, while also letting the Chinese build a military base and themselves building a base in Djibouti. Or the Saudis who can easily acquire a nuclear weapon from Pakistan with far less effort than the Iranians can with their nuclear program, nuke or not (because the Saudis funded the Pakistani nuclear programme, and above was one of the conditions).
Iran is currently "threatened" by 3 potential or active nuclear US allies - Israel, Pakistan and Saudi Arabia, so bad guys or not, geopolitics dictates that they too have to acquire nukes to maintain their survival. For the very reason that North Korea still exists while Ukraine has been invaded.
Apparently those things are not prerequisites to do lobbying. Or SA enacting basically a genocide in Yemen. Apparently that shouldn't stop lobbying.
However Iran is not and has not been actively engaging the US since Bush Jr Iraq War.
In fact Iran saved US allies in the region form ISIS. Iran was practically an ally of the US against ISIS. No Shia militia or Iran allied force has attacked the US in any way.
I would argue AQ types are a far bigger danger to actual US people then any Iranian militia and those don't get financing form Iran and its allies.
Not to mention Israel and what they are doing to Palestinians (and not to mention they are a rough nuclear nation) but of course "Iran is 'threading'" so of course that is simply not acceptable.