On Wednesday, the Justice Department said a civil rights division official, John Gore, would defy a subpoena to testify on Thursday about its addition of a citizenship question to the census. This week, White House lawyers indicated that they would tell the former White House counsel Donald F. McGahn II and other former officials not to comply with subpoenas for their testimony, a person familiar with the legal strategy said.

Mr. Trump has also sued to block a congressional subpoena of his accounting firm, Treasury Secretary Steven Mnuchin missed a deadline to turn over Mr. Trump’s tax returns to lawmakers and the former head of White House personnel security, Carl Kline, ignored a subpoena ordering him to appear for a deposition about overriding recommendations to deny security clearances.

Together, the events of the week made clear that Mr. Trump has adopted a strategy of unabashed resistance to oversight efforts by the House — reveling in abandoning even the pretense of trying to negotiate accommodations and compromise with the institution controlled by his political opponents.

“The president is attempting to repeal a congressional power of oversight that goes back to the administration of George Washington,” said Charles Tiefer, a former longtime House lawyer who is now a University of Baltimore law professor. He said “the comprehensiveness and intensity of this presidential stonewalling” exceeded anything he had seen in his 40-year career.

He added: “Congress can call witnesses about problems with the executive branch anytime. Otherwise there is no check on whether the executive branch is doing the public’s work or just exercising raw power.”

Speaking with reporters on Wednesday, Mr. Trump cited the end of the special counsel investigation to declare he had been investigated enough. “I thought after two years we’d be finished with it,” he said. “No. Now the House goes and starts subpoenas.” He added, “I say it’s enough.”