A letter drafted by Reps. Jesse Jackson Jr. (D-Ill.) and Mike Pence (R-Ind.) urging swift, tough sanctions on Iran will be mailed to President Barack ObamaBarack Hussein ObamaGOP lawmaker: Dems not standing for Trump is 'un-American' Forget the Nunes memo — where's the transparency with Trump’s personal finances? Mark Levin: Clinton colluded with Russia, 'paid for a warrant' to surveil Carter Page MORE on Monday with 366 House signatures.

Late Friday afternoon, Jackson's office said they were still in the process of gathering the hundreds of signatures on the letter.

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"Mr. President, you have stated this issue is a priority for your administration. You have attempted to engage the Iranian regime for over a year. You have gone to the United Nations Security Council in an effort to impose tough new sanctions on Iran. But time is not on our side," the letter states.

"We cannot allow those who would oppose or delay sanctions to govern either the timing or content of our efforts," it says, in reference to the lack of support at the Security Council by veto-wielders China and Russia.

The letter calls on Obama to "fulfill your June 2008 pledge that you would do 'everything in my power to prevent Iran from obtaining a nuclear weapon,'" to "rapidly" implement the sanctions legislation when it comes out of conference and use whatever presidential powers at his means to impose "punishing measures" on Tehran.

Jackson and Pence, along with Majority Leader Steny Hoyer (D-Md.) and Minority Whip Eric CantorEric Ivan Cantor'Release the memo' — let's stop pretending that Democrats are the defenders of the FBI Raúl Labrador, a model for Hispanic politicians reaching higher Eric Cantor: Moore ‘deserves to lose’ MORE (R-Va.), as well as Reps. Ileana Ros-Lehtinen (R-Fla.) and Dan Burton (R-Ind.), confirmed the culmination of their effort at a Wednesday afternoon press conference.

"This is a moment where traditional loyalties and interests give way to the interests of the United States of America," said Pence, who characterized the letter to Obama as "firm but respectful."

In the Senate, a similar letter circulated by Sens. Charles SchumerCharles (Chuck) Ellis SchumerGOP lawmaker: Dems not standing for Trump is 'un-American' Trump called for unity — he didn’t even last a week Overnight Defense: GOP plays hardball by attaching defense funding to CR | US reportedly drawing down in Iraq | Russia, US meet arms treaty deadline | Why the military wants 6B from Congress MORE (D-N.Y.) and Lindsey GrahamLindsey Olin GrahamMcConnell: 'Whoever gets to 60 wins' on immigration Overnight Tech: Uber exec says 'no justification' for covering up hack | Apple considers battery rebates | Regulators talk bitcoin | SpaceX launches world's most powerful rocket Overnight Cybersecurity: Tillerson proposes new cyber bureau at State | Senate bill would clarify cross-border data rules | Uber exec says 'no justification' for covering up breach MORE (R-S.C.) had gathered 76 signatures as of Wednesday, but that number had climbed to 80 as of Friday.

"Preventing Iran from obtaining nuclear weapons remains a diplomatic imperative," the letter states. "But time is not on the side of those who seek to prevent a nuclear Iran.

"... We urge you to move quickly to implement your existing authority on Iran and the legislation we send you, and to galvanize the international community to take immediate, substantive steps. Now is the time for action focused on preventing a nuclear Iran. We look forward to working with you on this important task."

In December, the House approved 412-12 a measure enabling Obama to ban foreign firms that supply Iran with refined petroleum from doing business in the U.S. The Senate passed its own version of sanctions targeting Iran's energy sector by voice vote on Jan. 28.

Next week, the House will move to instruct conferees and take the sanctions bill to conference.