Vice President Joe BidenJoseph (Joe) Robinette BidenObama tweets birthday message to Biden: 'The best vice president anybody could have' The Hill's 12:30 Report Tech beefs up lobbying amid Russia scrutiny MORE briefed a dozen Democratic senators on Wednesday on the negotiations with Iran over its nuclear weapons program.

The meeting came a day after President Obama pled with chairmen and ranking members from the intelligence, defense, and banking committees to hold off on new sanctions while negotiations continued.

"The Vice President underscored that the relief we would provide Iran as part of the first step would be modest and temporary compared to the substantial, continuing impact of our sanctions, which would be vigorously enforced throughout the first step," the White House said in a statement.

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The two-hour meeting included members of the vice president's national security team and some of the upper chamber's most dovish members.

Attendees included Sens. Richard Blumenthal (Conn.), Cory Booker (N.J.), Benjamin Cardin (Md.), Thomas Carper (Del.), Bob CaseyRobert (Bob) Patrick CaseyThe GOP tax bill will be a health care burden on American families Democrats scramble to contain Franken fallout  GOP campaign committees call on Democrats to return Franken donations MORE (Pa.), Al FrankenAlan (Al) Stuart FrankenReport: Conyers settled wrongful dismissal complaint over 'sexual advances' Arianna Huffington denies Franken behaved inappropriately in response to new photos Right way and wrong way MORE (Minn.), Tim KaineTimothy Michael KaineBooker tries to find the right lane  Democrats scramble to contain Franken fallout  GOP campaign committees call on Democrats to return Franken donations MORE (Va.), Joe ManchinJoseph (Joe) ManchinDemocrats scramble to contain Franken fallout  Overnight Finance: House passes sweeping tax bill in huge victory for GOP | Senate confirms banking regulator | Mulvaney eyed for interim head of consumer agency Overnight Regulation: Senators unveil bipartisan gun background check bill | FCC rolls back media regs | Family leave credit added to tax bill | Senate confirms banking watchdog MORE (W.Va.), Jeff MerkleyJeffrey (Jeff) Alan MerkleySenate Democrats introduce bill to block Trump's refugee ban Overnight Defense: Army secretary easily confirmed | Army denies changing mental health standards | US to trim peacekeeping funds | House passes bill to speed up approval of battlefield medicines Senate approves Trump's Army pick MORE (Ore.), Chris MurphyChristopher (Chris) Scott MurphyCongress must end American support for Saudi war in Yemen Jones raised 0K a day after first Moore accusers came forward: report Senate Democrats introduce bill to block Trump's refugee ban MORE (D-Conn.), Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenQuestions loom over Franken ethics probe State Dept. spokeswoman acknowledges 'morale issue' Democrats scramble to contain Franken fallout  MORE (N.H.), and Elizabeth WarrenElizabeth Ann WarrenCordray's legacy of consumer protection worth defending Booker tries to find the right lane  Jones raised 0K a day after first Moore accusers came forward: report MORE (Mass.).

During a panel hosted by the Wall Street Journal on Wednesday, Obama said he had told lawmakers and Israel that it was important to test whether a diplomatic solution was possible.

"Let's test the proposition over the next six months we can resolve this in a diplomatic fashion while maintaining the essential sanctions architecture," Obama said.

The president said that under the proposed short-term deal, the Iranians would halt their nuclear weapons program, roll back certain elements, and subject themselves to "vigorous inspections."

Obama said, the U.S. was offering a "very modest amount of relief that is entirely subject to reinstatement if in fact they violated any part of this earlier agreement."