House Democrats are threatening the salaries of Interior, Commerce and Justice Department staff if they block ongoing committee investigations.

House Oversight and Reform Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) sent letters Tuesday calling for eight current and former Trump administration officials to provide information for two of the panel’s investigations, cautioning that officials who block the interviews from taking place could see their salaries withheld.

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"Please be advised that any official at the Department who 'prohibits or prevents' or 'attempts or threatens to prohibit or prevent' any officer or employee of the Federal Government from speaking with the Committee could have his or her salary withheld pursuant to section 713 of the Financial Services and General Government Appropriations Act," Cummings wrote in the letters.

The move is the latest in an escalating power struggle between the Trump administration and House Democrats over investigations. Tensions between the White House and congressional Democrats have amplified in recent weeks, with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE telling reporters last month that he plans to fight "all the subpoenas."

The White House has directed multiple officials to ignore requests by House Democrats to turn over documents to the committee.

The committee noted seven of the eight interview requests recently made related to the panel’s probes were either denied or remain unanswered.

One interview request related to the addition of a question on citizenship to the 2020 census, and another was on whether Interior Secretary David Bernhardt and his staff complied with federal record-keeping laws.

In a letter sent to Director of Congressional and Legislative Affairs Cole Rojewski, Cummings noted the Department of Interior has not made Catherine Gulac, the administrative assistant to the deputy secretary; Gareth Rees, the executive assistant to the Office of the Deputy Secretary and Todd Willens, the acting chief of staff and associate deputy secretary — the four officials the committee asked to interview for the Interior probe — available, nor has the department provided documents requested by the committee despite receiving the request in March.

Cummings was joined by Subcommittee on Civil Rights and Civil Liberties Chairman Jamie Raskin Jamin (Jamie) Ben RaskinOn 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 House panel pulls Powell into partisan battles over pandemic Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Md.) in sending separate letters to Gene Hamilton, the Department of Justice counselor to the attorney general; Department of Commerce general counsel Peter Davidson; Earl Comstock, the Department of Commerce deputy chief of staff and director of policy; and James Uthmeier, the former senior adviser and counsel to the secretary of Commerce, calling upon the officials come to Capitol Hill to be interviewed later this month on the census question.