WASHINGTON (AP) — Vice President Joe Biden and senior Obama administration officials convinced a number of senators on Thursday to hold off on another round of Iran sanctions as Western powers test Tehran’s willingness to scale back its nuclear aims.

The full-court press didn’t sway every senator who participated in the hours-long, closed-door briefing, but the chances that the Senate Banking Committee would draft new, punitive measures next week just as negotiations occurred in Geneva diminished significantly.