A bipartisan group of senators asked the Trump administration to release $250 million in authorized military security assistance for Ukraine.

Sens. Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (R-Ohio), Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.), Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (D-Ill.), Richard Blumenthal (D-Conn.) and Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.) wrote a letter Tuesday to Office of Management and Budget Director Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE after Politico reported that the administration was delaying the aid.

They wrote that the funds have helped Ukraine develop its own military capabilities and maintain its sovereignty as it faces Russian attacks.

"In fact, Ukraine continues to fight daily on its eastern border against Russia-backed separatists in the provinces of Donetsk and Luhansk, and over 10,000 Ukrainian soldiers and civilians have lost their lives in this war," they wrote. "U.S.-funded security assistance has already helped turn the tide in this conflict, and it is necessary to ensure the protection of the sovereign territory of this young country, going forward."

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"This funding is crucial to the long term stability of Ukraine and has the continued backing and approval of the U.S. Congress which appropriated these funds. We strongly urge you to direct the Department of Defense to obligate these funds immediately," the senators added.

A Defense Department spokesperson told The Hill that the U.S. was working with Ukraine's government and the Multinational Joint Commission to evaluate the specific needs of Ukraine's armed forces.

The spokesperson added that the department does not publicly comment on internal budget deliberations.

“The President has made no secret when it comes to foreign assistance that U.S. interests abroad should be prioritized,” a senior administration official told The Hill in a statement Wednesday.

The Hill has reached out to the Office of Management and Budget for comment.

President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE asked officials to review the funding to make sure that it is being used to further U.S. interests, Politico reported last week, citing a senior administration official. Those asked to review the funding reportedly include Defense Secretary Mark Esper Mark EsperOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May MORE and national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE.

President Trump has recently faced scrutiny over statements about Russia. He said last month that he would he would "certainly" invite Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE to the next Group of Seven summit. Russia was expelled from what was then the Group of Eight because of its annexation of the Crimean Peninsula from Ukraine in 2014.