U.S.-Iran deal receives muted praise from senators in secrecy.

Senate Democrats are calling for a prompt update, while some Republicans admit their own lack of knowledge about the unannounced pact.

On Capitol Hill, lawmakers expressed guarded enthusiasm for President Trump's announcement of a tentative U.S.-Iran accord, with some Republicans hesitant to endorse a pact shrouded in secrecy until its details are revealed by the administration.

Senator John Thune, the majority leader from South Dakota, cautioned that no deal has been finalized, indicating that details would emerge once they become available. He predicted strong curiosity among his colleagues regarding the proposed agreement's specifics.

Upon their return to Washington on Monday, lawmakers expressed cautious optimism about any potential detente with Iran, while also voicing concerns that Congress remains in the dark about crucial details of the emerging agreement.

Senator Thom Tillis expressed skepticism about the U.S.-Iran agreement, questioning its credibility due to its secretive nature on Monday afternoon.

Senate Republicans are awaiting a briefing from the administration on the Iran agreement, while Democrats insist on transparency.

The announcement of a potential U.S.-Iran deal by Trump has left many questions unanswered, nearly 24 hours on. Senator Chuck Schumer, minority leader from New York, emphasized the need for transparency in a Senate floor address. He urged Trump to provide Congress and the public with immediate details about his understanding with Iran, bringing an end to the ongoing conflict.

Senators Thune and Schumer, part of the secretive Gang of Eight, typically receive sensitive briefing on classified intelligence issues from their congressional colleagues.

New Hampshire's Senator Jeanne Shaheen, ranking Democrat on the Foreign Relations Committee, emphasized the need for Congressional transparency. She urged lawmakers to review the agreement promptly, emphasizing that Senate approval is mandatory under existing laws for any nuclear deal reached with Iran.

The White House has been tight-lipped with lawmakers on the conflict in Iran since its inception, while Senate Republicans initially avoided scrutinizing the situation. However a shift is underway as several Republican leaders now echo Democratic calls for greater transparency.

Despite being kept in the dark on specifics, several Republican lawmakers remained reserved.

Senator Bernie Moreno, a Republican from Ohio, expressed confidence in President Trump's ability to foster Middle Eastern peace through his diplomatic efforts.

Republican hardliners expressed marked reservations openly.

Senator Lindsey Graham expressed skepticism about the U.S.-Iran deal, stating that he prefers to review the actual document rather than relying on Iranian reports. He dodged direct attribution of the agreement to the President, instead crediting the Vice President and the Trump Administration for its conception.

Senator Graham emphasized that prompt release would be beneficial.

Optimism about the potential deal was still present among some Republican lawmakers, but they emphasized that Congressional approval would be essential for any nuclear pact with Iran.

South Dakota Senator Mike Rounds expressed skepticism about the Obama administration's nuclear deal with Iran in 2015, pointing out that Congress had not given its formal approval, rendering it nonbinding. To avoid another partisan agreement, Rounds emphasized that any new pact must undergo Senate ratification to be considered a legitimate accord.