The chairs of two House panels are demanding that the White House turn over documents and information about military aid withheld from Ukraine amid scrutiny over 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's interactions with the country.

House Budget Committee Chairman John Yarmuth John Allen YarmuthPelosi, Democrats unveil bills to rein in alleged White House abuses of power GOP, White House struggle to unite behind COVID-19 relief House seeks ways to honor John Lewis MORE (D-Ky.) and Appropriations Chairwoman Nita Lowey Nita Sue LoweyTop House Democrats call for watchdog probe into Pompeo's Jerusalem speech With Biden, advocates sense momentum for lifting abortion funding ban Progressives look to flex their muscle in next Congress after primary wins MORE (D-N.Y.) sent a letter to the White House Office of Management and Budget (OMB) on Friday demanding information about the efforts.

Yarmuth and Lowey wrote that the decision to hold up congressionally approved funds over the summer represented a potential "abuse of authority" by the president on apportioning money, suggesting the move may have violated the Impoundment Control Act of 1974.

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Trump's decision to temporarily withhold $400 million in security assistance from Ukraine before asking Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE in a July 25 phone call is at the heart of mounting scrutiny that has bolstered calls for impeachment.

The president confirmed earlier this week that he held up the funds from Ukraine but argued he did so because he wanted European countries to contribute more for the cause. Democrats, meanwhile, have raised alarms about the move coming as Trump and his allies pushed Ukraine to investigate Biden.

In their letter Friday, the Democratic chairs demanded that the White House turn over information and documents by Oct. 1 showing when the funds were held up and provide further documentation by Oct. 11 about what agencies were involved in the process.

The hold put on the aid, they said, fueled concerns "that OMB took the unusual and seemingly unprecedented step of delegating the authority to execute these apportionments to a political appointee, in lieu of career civil servants who have historically been the designated officials responsible for overseeing and executing these technical budget documents."

The letter was addressed to acting OMB Directer Russell Vought and acting White House chief of staff 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, and may provide Democrats information pertinent to drafting articles of impeachment against the president as part of their ramped-up investigation.