Schiff: Trump requests to China, Ukraine are 'fundamental breach' of office

House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffLawmakers prep ahead of impeachment hearing Top Republican: Democrats' weekend document dump shows impeachment inquiry is a 'farce' Nunes: 'Sickening' that Schiff obtained his phone records MORE (D-Calif.) on Thursday blasted President TrumpDonald John TrumpLawmakers prep ahead of impeachment hearing Democrats gear up for high-stakes Judiciary hearing Warren says she made almost M from legal work over past three decades MORE for asking China and Ukraine to investigate former Vice President Joe BidenJoe BidenBiden: Buttigieg 'doesn't have significant black support even in his own city' Biden: 'I'd add' Warren to my list of potential VP picks How can top Democrats run the economy with no business skill? MORE, calling it a "fundamental breach" of presidential decorum and a threat to national security.

Emerging from a closed-door meeting in the Capitol basement, where lawmakers from three committees are interviewing a key witness as part of the Democrats' impeachment inquiry, Schiff said the comments are evidence that Trump has ignored the lessons from former special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump MORE’s investigation into Russian interference — and Mueller's warnings of ongoing foreign influence over critical domestic affairs.

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"To have the president of the United States suggesting — urging — a foreign country to interfere in our presidential elections is an illustration that this president, if he learned anything from the two years of the Mueller investigation, it's that he feels he can do anything with impunity," Schiff told a crowd of reporters staking out the meeting.

"The president of the United States encouraging a foreign nation to interfere again to help his campaign by investigating a rival is a fundamental breach of the presidential oath of office," Schiff continued. "It endangers our elections; it endangers our national security. It ought to be condemned by every member of this body, Democrats and Republicans alike."

Hours earlier, Trump raised plenty of eyebrows when he called on the leaders of China and Ukraine to investigate Biden and his son Hunter Biden.

"I would think that if they were honest about it they’d start a major investigation into the Bidens,” Trump told reporters at the White House.

Trump is already under fire after the recent revelation, unveiled in an anonymous whistleblower complaint, that Trump had urged Ukraine's president in July to investigate corruption allegations against the Bidens.

In response, Speaker Nancy PelosiNancy PelosiDemocrats gear up for high-stakes Judiciary hearing White House, Democrats strike tentative deal to create Space Force in exchange for federal parental leave benefits: report Trump: Fox News 'panders' to Democrats by having on liberal guests MORE (D-Calif.), after months tamping down the impeachment push, endorsed a formal inquiry. As part of the process, Democrats have subpoenaed administration documents related to the Ukraine affair, while seeking depositions from a handful of current and former State Department officials with knowledge of the episode.

The first interview is being conducted Thursday in the Capitol, where Schiff is leading the deposition of Kurt VolkerKurt VolkerPush to investigate Bidens sets up potential for Senate turf war Senate confirms Brouillette to replace Perry as Energy secretary How Democrats' missing witnesses could fill in the Ukraine story MORE, the Trump administration's former envoy to Ukraine. Also in attendance are members of the Oversight and Reform and Foreign Affairs committees.

Participating lawmakers of both parties have been tight-lipped about the details of their interview.

Rep. Mark MeadowsMark Randall MeadowsLawmakers prep ahead of impeachment hearing Democrats express confidence in case as impeachment speeds forward Sunday shows — Nadler: A jury would convict Trump in 'three minutes flat' MORE (R-N.C.), a close Trump ally, said Volker was providing "clarity" surrounding Trump's July request to the Ukrainian president.

"Anytime that you can add clarity to what actually happened is a good day for Americans," Meadows said. "And I think we're getting more clarity."