Washington (CNN) The White House is ignoring a bipartisan congressional inquiry regarding documents about the Rob Porter scandal, prompting the House Oversight Committee's top Democrat to request that the White House be subpoenaed over the matter.

The committee's investigation into White House security clearances began after Porter, a former staff secretary, resigned amid domestic abuse allegations, which he denies. The allegations prevented Porter from obtaining a full security clearance and have since raised questions about other White House officials operating without one.

House Oversight Committee chair Rep. Trey Gowdy, R-South Carolina, sent a letter to the White House last month asking for a wide range of details over the Porter matter, demanding they comply by February 28. They wanted a detailed timeline of the Porter background check by the FBI, when White House officials became aware of his problems and what they did about it.

"Last night, we received a completely inadequate response from the White House regarding our Committee's request for information about security clearances," Rep. Elijah Cummings, D-Maryland, wrote in a letter Friday to Gowdy.

The committee received a brief letter Thursday night from White House legislative director Marc Short, pointing to the changes that chief of staff John Kelly made to the security clearance process -- and ignoring the questions about Porter. Instead, Short touted a working group aimed at improving the clearance process and vowed to keep them apprised of the matter "at the appropriate time."

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