The Democratic chairman of the US House Oversight Committee on Wednesday accused President Donald Trump of a “unprecedented, and growing pattern of obstruction” after he ordered federal employees not to comply with congressional investigations. The Republican president ordered officials not to obey legal requests from the Democratic-led House of Representatives, which is carrying out multiple investigations of his administration, including his tax returns, White House security clearances and the probe of Russian interference in US politics. “President Trump and Attorney General (William) Barr are now openly ordering federal employees to ignore congressional subpoenas and simply not show up — without any assertion of a valid legal privilege,” Representative Elijah Cummings, who chairs the House Oversight Committee, said in a statement. “This is a massive, unprecedented, and growing pattern of obstruction,” Cummings added, warning federal employees to “think very carefully about their own legal interests” in refusing to comply with the panel’s requests. The Republican president ordered officials not to obey legal requests from the Democratic-led House of Representatives The president vowed to resist every subpoena from House Democrats investigating his administration and to fight any effort by them to impeach him. Trump’s removal from office is most unlikely barring a change of heart by his fellow Republicans, who hold a majority in the US Senate. Trump filed a lawsuit earlier this week to prevent material from being turned over to lawmakers, and on Wednesday the Justice Department rebuffed a House committee’s request for an interview with an official involved in the administration’s decision to put a citizenship question on the 2020 census. The department said John Gore, a deputy assistant attorney general in the Civil Rights Division, would not participate in a deposition scheduled for Thursday if he could not have a Justice Department lawyer at his side. The committee had offered to allow a lawyer to sit in a different room. Cummings said the committee would gather to hear Gore’s deposition on Thursday and suggested he “should be well aware of his constitutional, legal and ethical obligations to comply with a duly authorized subpoena” from Congress. A Department of Justice (DOJ) official said the committee had provided “no legitimate or constitutional basis for excluding a DOJ lawyer from assisting at the deposition.” “If a DOJ lawyer may appear to protect privileged subjects, then the Attorney General will allow the deposition to go forward,” the official said, speaking on condition of anonymity.