President Donald Trump and his administration have ignored House Democrats’ request for documents as part of a sweeping corruption probe.

In total, 81 officials — more than 60 of whom work in the administration — reportedly received requests earlier this month. Politico reported that White House officials have been “unusually hostile” in responding to the document requests. Rep. Jerrold Nadler (D-N.Y.), the House Judiciary chairman, is leading the Trump corruption investigation, one of several inquiries many congressional committees are launching into the president, his businesses and his family and associates.

The Trump administration has also reportedly refused to comply with requests from the Oversight, Intelligence and Foreign Affairs committees regarding the president’s conversations with Russian President Vladimir Putinas well as requests about Trump’s national emergency declaration from last month to build the border wall without congressional approval in order to curb illegal immigration. Both the Democratic-controlled House and the Republican-controlled Senate voted to reject Trump’s emergency declaration, although the president quickly responded by vowing to veto Congress’s decision. Lawmakers could then potentially override this veto.

“The White House is taking the exact right tactic to ignore the requests and see what comes of it. I wouldn’t respect [the Democrats’] process,” David Bossie, an adviser to Trump, told Politico.

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Among those contacted for document requests are Trump’s eldest sons Donald Trump Jr. and Eric Trump, former White House counsel Don McGahn and Allen Weisselbergthe chief financial officer of the Trump Organization. More current and former Trump associates have also reportedly received document requests in recent days:

The White House has also recently refused to come clean about several other issues, like the reasons for and process by which Ivanka Trump and Jared Kushner were granted top security clearances. House Democrats have also rebuked the administration for this.