Romney: Trump asking Ukraine to investigate political rival 'would be troubling in the extreme'

Sen. Mitt RomneyWillard (Mitt) Mitt RomneyTrump knocks Romney as 'Democrat secret asset' in new video Overnight Defense — Presented by Boeing — Trump insists Turkey wants cease-fire | Fighting continues in Syrian town | Pentagon chief headed to Mideast | Mattis responds to criticism from Trump Fighting continues in Syrian town despite cease-fire deal MORE (R-Utah) said on Sunday it would be “troubling in the extreme” if President TrumpDonald John TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS MORE urged Ukrainian officials to investigate former Vice President Joe BidenJoe BidenTrump knocks Romney as 'Democrat secret asset' in new video Giuliani asked State Dept. to grant visa for ex-Ukraine official at center of Biden allegations: report Perry won't comply with subpoena in impeachment inquiry MORE.

“If the President asked or pressured Ukraine’s president to investigate his political rival, either directly or through his personal attorney, it would be troubling in the extreme. Critical for the facts to come out,” Romney tweeted.

The tweet comes amid reports that both Trump and his attorney Rudy GiulianiRudy GiulianiGiuliani asked State Dept. to grant visa for ex-Ukraine official at center of Biden allegations: report Overnight Energy: Trump taps deputy energy secretary to replace Perry | Praises pick Dan Brouillette as 'total professional' | Perry denies quid pro quo over Ukraine Ex-Watergate prosecutor says evidence in impeachment inquiry 'clearly' points to Trump MORE have attempted to persuade Ukrainian president Volodymyr Zelenskiy to investigate Biden or his son.

Romney is one of the first Republican officials to deliver anything other than an unqualified defense of Trump on the subject.

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The existence of an anonymous whistleblower report that purportedly alleges Trump asked Zelenskiy for an investigation several times on a call was made public last week.

The White House has yet to release a transcript of the call or the full complaint, although Trump implied on Sunday that he had discussed Biden with the Ukrainian president, telling reporters the topic of discussion “was largely the fact that we don't want our people like Vice President Biden and his son [contributing] to the corruption already in the Ukraine.”

House Speaker Nancy PelosiNancy PelosiCummings to lie in state at the Capitol House Republicans 'demand the release of the rules' on impeachment Overnight Health Care — Presented by National Taxpayers Union —Dem wants more changes to Pelosi drug pricing bill | Ebola outbreak wanes, but funding lags | Johnson & Johnson recalls batch of baby powder after asbestos traces found MORE (D-Calif.) said Sunday in a letter that “if the Administration persists in blocking this whistleblower from disclosing to Congress a serious possible breach of constitutional duties by the president, they will be entering a grave new chapter of lawlessness which will take us into a whole new stage of investigation.”