WASHINGTON (AP) — Demands in Congress grew Wednesday for a speedy escalation of sanctions against Iran as two days of nuclear talks ended in Geneva, setting up a potential foreign policy clash with the Obama administration while it seeks a diplomatic end to the standoff with Tehran.

Even as negotiations between world powers and Iran ended on an upbeat note, with a new round of discussions set for November, lawmakers seeking to end a government shutdown back in Washington quickly expressed their skepticism and laid out red lines for the talks. Members of both parties have overwhelmingly backed tougher economic pressure on Iran in recent years amid concern it is closing in on nuclear weapons capability.