WASHINGTON — Secretary of State John Kerry has implored skeptical senators not to criticize nuclear negotiations with Iran before a deal can be crafted, but he’s certain to get another round of questions about the sensitive talks from members of the House.

Kerry’s second appearance in two days on Capitol Hill follows Tuesday’s session before a Senate panel. He already has been asked about the fight against Islamic State militants, Russia’s meddling in neighboring Ukraine, the crisis in Syria and the sensitive negotiations under way to prevent Iran from being able to have nuclear weapons.

Negotiators are rushing to try to meet a March 31 deadline for a framework agreement that would keep Tehran from being able to develop nuclear weapons.

“The president has made clear — I can’t state this more firmly — the policy is Iran will not get a nuclear weapon,” Kerry told members of a Senate Appropriations subcommittee. “And anybody running around right now, jumping in to say, ‘Well, we don’t like the deal,’ or this or that, doesn’t know what the deal is. There is no deal yet. And I caution people to wait and see what these negotiations produce.”

Kerry went to the Senate a day after returning to Washington from the latest round of talks in Geneva involving Iran, the U.S. and five other world powers. U.S. and Iranian officials reported progress on getting to a deal.