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

House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffWhite House staggers after tumultuous 48 hours Trump embarks on Twitter spree amid impeachment inquiry, Syria outrage House Republicans 'demand the release of the rules' on impeachment MORE (D-Calif.) on Thursday blasted President TrumpDonald John TrumpPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash CNN's Anderson Cooper mocks WH press secretary over Fox News interview MORE for asking China and Ukraine to investigate former Vice President Joe BidenJoe BidenCNN's Anderson Cooper mocks WH press secretary over Fox News interview Yang cautions Democrats: Impeachment might not be 'successful' Ocasio-Cortez: Sanders' heart attack was a 'gut check' moment 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 MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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 PelosiPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash Scrap House defense authorization provision benefitting Russia 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 VolkerPerry won't comply with subpoena in impeachment inquiry Ex-Watergate prosecutor says evidence in impeachment inquiry 'clearly' points to Trump Trump confirms Rick Perry to step down as Energy secretary 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 MeadowsTestimony from GOP diplomat complicates Trump defense Obama: Cummings showed us 'the importance of checks and balances' The Hill's Morning Report - Tempers boil over at the White House 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."