Never Give Up, Never Surrender!

Netanyahu the Eighth, 80 years into the Iranian-American war. (Artist's Rendition)

In his speech to congress, Israeli PM Netanyahu came out strongly against a deal with Iran to limit their nuclear program.  

Now, a decade may seem like a long time in political life, but it's the blink of an eye in the life of a nation. It's a blink of an eye in the life of our children. We all have a responsibility to consider what will happen when Iran's nuclear capabilities are virtually unrestricted and all the sanctions will have been lifted. Iran would then be free to build a huge nuclear capacity that could product many, many nuclear bombs. 
Iran's Supreme Leader says that openly. He says, Iran plans to have 190,000 centrifuges, not 6,000 or even the 19,000 that Iran has today, but 10 times that amount -- 190,000 centrifuges enriching uranium. With this massive capacity, Iran could make the fuel for an entire nuclear arsenal and this in a matter of weeks, once it makes that decision. 
My long-time friend, John Kerry, Secretary of State, confirmed last week that Iran could legitimately possess that massive centrifuge capacity when the deal expires.

The exact details of a deal aren't public, but it seems likely that Netanyahu has someone privy to the secret talks keeping him up to date.  That said, I find it highly unlikely that these details are concrete.  Things can change very rapidly in negotiations.

So why the pressure?

The easiest answer is that this is a political ploy designed to win Netanyahu a few more votes in the Israeli parliament.  The second answer is that Netanyahu doesn't trust Obama to make a good deal with Iran.  This could put pressure on Obama to negotiate harder.  It could be an attempt to damage Obama politically, seeing as Israel is (for now) very popular in the US.

The best answer is probably e) All of the above.