Four senior Senate Republicans called on President Joe Biden on Tuesday—the same day when the United States and Iran held indirect talks in Vienna—urging him not to return to the Iran nuclear deal and lift the sanctions. Sens. Jim Inhofe (R-Okla.), Marco Rubio (R-Fla.), Pat Toomey (R-Pa.), and Todd Young (R-Ind.), leaders of several Senate committees or sub-committees, sent an open letter (pdf) to Biden expressing their concerns about the United States returning to the Iran nuclear deal—the Joint Comprehensive Plan of Action (JCPOA). “The United States must not relinquish its leverage over the Iranian regime just to return to the JCPOA, a severely flawed agreement that undermines our national security interests due to its arbitrary sunsets and limited scope,” the senators said in the letter, referring to the sanctions as “an enormous amount of leverage.” “Unfortunately, recent comments from Administration officials suggest that is exactly what the U.S. intends …