The Republican chairman of the Senate Intelligence Committee on Wednesday delivered an unsparing scolding to four senior intelligence and law enforcement officials who repeatedly refused to answer lawmakers' questions.

“At no time should you be in a position where you come to Congress without an answer,” Sen. Richard Burr Richard Mauze BurrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs Rep. Mark Walker says he's been contacted about Liberty University vacancy MORE (R-N.C.) told the officials before gaveling out the nearly three-hour hearing.

“It may be in a different format but the requirements of our oversight duties and your agencies demand it," he added.

National Security Agency head Adm. Mike Rogers, National Intelligence Director Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE, Deputy Attorney General Rod Rosenstein and acting FBI Director Andrew McCabe had declined extensive questioning from Democrats — and some Republicans — about reports that President Trump asked officials to intervene in or counter the FBI’s investigation into Russian interference in the election.

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Both Coats and Rogers denied feeling pressured by Trump to intervene in the handling of intelligence in any inappropriate way — but refused to answer specific questions about their interactions with the president.

None of the Trump administration officials were able to satisfy Democrats on the legal justification for their silence.

“Why are you not answering these questions? Is there an invocation of executive privilege?” demanded Sen. Angus King Angus KingHopes for DC, Puerto Rico statehood rise Government watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up MORE (Maine), an independent who caucuses with the Democrats. “I’m not satisfied with, ‘I do not believe it’s appropriate’ or ‘I do not believe I should answer.’”

“I’m not sure I have a legal basis,” Coats said. He added that he would provide as much information as he was able behind closed doors.

Rogers indicated that while he and Coats have had conversations with the White House about a potential claim of executive privilege, he said that they had not gotten a definitive answer.

McCabe and Rosenstein both cited the ongoing federal investigation, led by special counsel Robert Mueller, into possible ties between the Trump campaign and Moscow in arguing that it is longstanding Justice Department procedure not to discuss anything that might be under active investigation.

Burr had previously intervened on behalf of the witnesses after a series of tense exchanges during which Democrats cut off or talked over their answers. He snapped that the “committee is on notice” to allow witnesses a chance to respond.

But as he closed the hearing, which was ostensibly about the sunset of a commonly used surveillance law that turned into a grilling on Trump and the federal investigation, he put the witnesses themselves on notice.

“I would ask each of you to take a message back to the administration,” he started.

Citing a notification mechanism by which officials can communicate with the top eight members of Congress — the so-called “gang of eight” — Burr argued pointedly that the officials “are required to keep this committee fully informed.”

“Congressional oversight of the intelligence activities of our government is necessary and it must be robust," he said.