It's complicated. The simplest answer is to say that Congress could not "unapprove it".
Under a typical treaty analysis, President Obama would be required by the US Constitution to get Senate ratification of the treaty with a two-thirds majority. However, Obama argued that the Iran Deal was an "executive agreement" and not a "treaty". As an executive agreement, the President is not required to seek Congressional approval, but he may grant Congress the right to vote up or down on the agreement. This up or down vote is a plain majority vote in the Congress, but can be vetoed by the President. This effectively makes the approval requirement for an "executive agreement" the almost-exact reverse of the approval requirement for a "treaty". Instead of two-thirds of the Senate being required to approve a "treaty", now, two-thirds of the Senate and two-thirds of the House of Representatives are required to override the Presidential veto preventing their disapproval of the "executive action" from coming to pass. Congress was not able to muster the two-thirds needed to oppose the Iran Nuclear Deal.
Note that Obama is not the first or only President to use this legal finagling in order to avoid a direct Senate vote. "Executive Agreements" were first invented by Franklin D. Roosevelt and were used by all subsequent US Presidents.
Yes, Iran agreed to the Iran nuclear deal.
A law introducing Conscription.
He had congress pass bills to address the problems. To pass the New Deal congress only took 38 minuets to pass it and send it to the president.
They called it ''The New deal''.
As part of a deal, to get the South to accept the entry of California into the USA as free soil.
SuperNews - 2005 Iran Deal or No Deal 1-21 was released on: USA: 15 June 2006
There are a lot of parameters to the deal, but at its most simple, the deal guarantees serious inspections of Iran's nuclear capabilities and effectively preventing Iran from getting a nuclear weapon in exchange for removing a number of sanctions imposed on Iran and unfreezing Iranian assets in foreign banks.
only the congress can make laws, so he has to deal with them to make a law:)
The New Deal
No. Iran lies entirely north of the Tropic of Cancer.
Iran has its own money; just like any other country. In terms of Iran's foreign assets, most of these are in Swiss Banks. Prior to Obama's Iran Deal in September 2015, they were frozen as part of the international sanctions against Iran. The Swiss government is now taking actions to unfreeze the assets in accordance with the Iran deal.
He had congress pass bills to address the problems. To pass the New Deal congress only took 38 minuets to pass it and send it to the president.