A bipartisan group of senators led by Sens. Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) is urging that an additional $320 million for Israeli missile defense be added to a defense bill.

"Amid growing rocket and missile threats in the Middle East, it is prudent for the United States and Israel to advance and accelerate bilateral cooperation on missile defense technologies," the senators said in a letter to the Armed Services Committee chairmen that was first obtained by The Hill.

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So far, 19 Republicans and 17 Democrats have signed on to the letter, including Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE's vice presidential pick, Sen. Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE (D-Va.).

The proposed increase, of $319.9 million, would go toward three U.S.-Israeli missile defense programs and more purchases of Iron Dome systems, which would include co-production of the systems in the U.S.

The senators are urging their colleagues, who are working with House members on a final version of the 2017 National Defense Authorization Act (NDAA), to include the funding levels authorized by the House's bill, rather than the Senate's.

The House bill authorizes $600.7 million for research, development, test and evaluation (RDT&E) and procurement of the systems, while the Senate bill authorizes $280.8 million.

The difference is that the House bill fully authorizes funding requests by Israel on RDT&E, procurement of the Iron Dome system, and the Arrow weapon, upper tier, or Arrow 3, and David's Sling programs, while the Senate bill would authorize $29.9 million less for RDT&E and $290 million less for procurement.

Senators and House members are working to mesh the two authorization bills together and produce a conference report to send to both chambers for approval before sending it to the president's desk.

"We believe that fully funding U.S.-Israeli missile defense programs at $601 million, as funded by the House-passed NDAA, is a level that will allow Israel to fully meet its national security requirements," the senators wrote to conference chairmen Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) and Rep. Mac Thornberry (R-Texas).

"We urge you to work in a bicameral, bipartisan manner to find a satisfactory solution to fully fund these U.S.-Israel programs," they wrote.

The Iron Dome system is designed to intercept short-range rockets between two and 45 miles that fired at population centers from the Gaza Strip, Syria, Lebanon or the Sinai Peninsula.

The Arrow weapon system is an anti-ballistic missile program aimed at defending against imminent and emerging missile threats while also providing data and technology that advances U.S. missile defense programs, the letter said.

David's Sling, which complements Iron Dome and Arrow, provides enhanced defense from large-caliber artillery rockets, tactical ballistic missiles and cruise missiles.

"These joint U.S.-Israel programs continue to yield critical defense capabilities that protect Israel from missile and rocket threats from as near as the Gaza Strip and Lebanon to as far as Iran," the senators wrote.

"As you know, investments over the years in U.S.-Israeli missile defense programs have saved the lives of countless civilians from indiscriminate rocket and missile attacks," they wrote.

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Democratic signatories include Sens. Gillibrand; Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (Wis.), Gary C. Peters (Mich.), Ed Markey Edward (Ed) John MarkeySchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy MORE (Mass.), Maria Cantwell Maria Elaine CantwellHillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes Bipartisan senators call for investigation of popular fertility app The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans MORE (Wash.), Richard Blumenthal (Conn.), Charles Schumer Chuck SchumerRepublican senator says plans to confirm justice before election 'completely consistent with the precedent' Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year MORE (N.Y.), Ron Wyden Ronald (Ron) Lee WydenGOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate GOP senator blocks Schumer resolution aimed at Biden probe as tensions run high MORE (Ore.), Robert Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.), Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (Mich.), Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (Colo.), Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (Fla.), Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (Va.), Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (Minn.), Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE Jr. (Pa.), Ben Cardin Benjamin (Ben) Louis CardinPPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help Senate passes extension of application deadline for PPP small-business loans MORE (Md.) and Kaine.