Connecticut Sen. Chris Murphy said Sunday there's no reason for the United States to pull back from the Iran nuclear agreement because the Iranians haven't violated it yet.

Murphy said on "Fox News Sunday" Trump's own advisors didn't want him to decertify Iran's compliance with the deal that is meant to keep them from getting a nuclear weapon. While the deal may be flawed, Trump's better off working within the deal than getting rid of it, Murphy said.

And, if Trump were to pull the U.S. out of the agreement, it would hand the Iranians everything they want, he said.

"There's not a single advisor around the president that advised him to decertify the Iran deal, the fact of the matter is Iran is compliant with the agreements, the White House is required to tell Congress if they are not," Murphy said. "They have submitted absolutely no submissions."

"There is no chance that the deal is going to be renegotiated, the Iranians will not renegotiate and neither will the Europeans. If we were to pull all of this agreement as the president is threatening, Iran would get everything they want. They would be able to restart their nuclear program because we would be in violation of the deal, the Europeans would continue to give sanctions or relief. They would look like the victim in the situation."

Murphy said Iran has mostly acted in good faith with the agreement to this point and isn't doing anything that would warrant decertifying their compliance.

"The president and his advisors have made it absolutely clear, the Iranians are in compliance with the agreement. To the extent that there have been instances of noncompliance they got right back in compliance," he said.

"The national security adviser [H.R. McMaster] is right, military sites are not automatically subject to inspection but we have the right at any time if we believe that there was nuclear activity happening on those sites to request access. We have never had a problem with a request, we have never had an incident of noncompliance because a request was made to get into those sites."

Murphy said the administration's complaints about the deal's failures are misplaced because Congress has given them the ability to install new sanctions on Iran.

However, the administration has so far chosen not to enforce those sanctions, he said.

"The president hasn't implemented those sanctions so the White House can't complain that Iran is still acting in that manner in the region and then not implement the powers that we have given him to try and stop that behavior," he said.