President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Monday tweeted out a video mocking Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) over his failed 2012 presidential bid, comparing it with Trump's own success four years later.

The video includes clips of election night in 2012, when Romney lost to former President Obama, and in 2016, when Trump defeated Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE.

The video was posted just hours after Romney told reporters that he wants the Trump administration to give Congress the transcript of a highly controversial call between the president and his Ukrainian counterpart, Volodymyr Zelensky.

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The call between Trump and Zelensky is reportedly tied to a whistleblower complaint that has dominated headlines since late last week amid reports that Trump and his attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE attempted to persuade Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE or his son Hunter Biden, who had business dealings in the country.

"What has been alleged by some news sources is that the president asked for an investigation into Mr. Biden. That would be in my view very inappropriate and a very serious allegation itself, so let's find out what exactly what was said," Romney said earlier Monday.

Over the weekend, Romney became one of the first GOP senators to raise serious concerns about the phone call.

"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," he tweeted.

Most Republicans have not held back on criticizing Trump for the situation, while Democrats have used the whistleblower complaint to fuel new demands that the House move on impeachment.

Romney has emerged as one of Trump's few GOP critics in Congress, particularly on issues of foreign policy.