(CNN) The White House is rejecting House Oversight Chairman Elijah Cummings' request to interview a former White House official who now represents the Trump Organization, the latest skirmish between the Trump administration and the House Democrats investigating President Donald Trump and his administration.

The White House and oversight panel chairman also clashed Monday over the committee's review of security clearance documents amid reports that Trump was involved in the approval of security clearances for his son-in-law Jared Kushner and daughter Ivanka Trump.

In a letter to Cummings, White House Counsel Pat Cipollone accused the committee of making "grossly unfair" allegations against Stefan Passantino and Trump's personal attorney Sheri Dillon -- both of whom Cummings wants to interview -- and damaging their reputations.

Last month, Cummings sent a letter to Cipollone that stated the committee had obtained new documents showing Passantino and Dillon "may have provided false information" when they were questioned by federal ethics officials about hush money payments paid to adult-film actress Stormy Daniels.

Cummings requested an interview with both attorneys.

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