U.S. officials are finalizing a new effort to crackdown on Iran’s top terror organization as part of an effort to reverse sweeping sanctions originally granted by the Obama administration as part of a little known deal to enrich entities tied to the powerful Revolutionary Guard Corps, or IRGC, according to sources familiar with the effort.

In late fall of 2016, the Obama administration loosened prohibitions on doing business with companies tied to the IRGC—which is responsible for the deaths of hundreds of Americans—by publishing new language on what constituted IRGC “control” of these entities.

This back-door concession to Iran sparked outrage from lawmakers and pro-Israel groups and later fueled a Trump administration push to declare the IRGC a terror organization.

A new congressional bid will now seek to revise that standard for IRGC “control,” reversing a portion of Obama-era sanctions relief that has helped Iran fund its massive military intervention in Syria and other regional hotspots. The push is already said to be gaining support from the American Israel Public Affairs Committee, or AIPAC, the United States’s leading pro-Israel lobbying group, which will support the new effort during its annual policy conference in Washington, D.C., next month.

[CLICK HERE To Follow The Trump Train On Twitter]