Sen. Mitt Romney during a July Senate hearing in Washington, D.C. Photo: Greg Nash-Pool/Getty Images

Sen. Mitt Romney (R-Utah) reacted Wednesday night to President Trump's refusal to commit to a peaceful transition of power should he lose November's election by saying to do so would be "unthinkable and unacceptable."

The big picture: "Fundamental to democracy is the peaceful transition of power; without that, there is Belarus," Romney tweeted. "Any suggestion that a president might not respect this Constitutional guarantee is both unthinkable and unacceptable." Trump has repeatedly baselessly insisted that mail-in ballots would lead to widespread fraud and made unfounded claims that he'd only lose the election if it were "rigged."

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Always Trumpers: The president’s unbreakable wall

Data: Axios research and FiveThirtyEight's Trump Score. See our methodology here. Note(*): Senator Mitt Romney did not join Congress until January 2019. However, statements he made as a prominent GOP figure prior to his time in office were taken into consideration. Chart: Naema Ahmed, Sara Wise, Juliet Bartz, Orion Rummler/Axios

More than 85% of elected Republicans who have been in Congress throughout President Trump’s term have largely stood by him through seven crises that would have crushed most politicians, according to a comprehensive new study by "Axios on HBO."

Why it matters: The data shows how Trump’s grip on the Republican Party has tightened — especially in the last two years — as his dissenters have largely piped down, been tossed out, or currently face the threat of losing re-election.

Pence to continue traveling despite aides testing positive for COVID-19

Marc Short with Pence in March. Photo: Drew Angerer/Getty Images

Marc Short, Vice President Mike Pence’s chief of staff, tested positive for the coronavirus Saturday and is quarantining, according to a White House statement.

Why it matters: Short is Pence's closest aide, and was one of the most powerful forces on the White House coronavirus task force. Pence and second lady Karen Pence tested negative for the virus on Sunday morning, according to the vice president's office.

AOC: "Extremely important" that Biden offer Bernie Sanders a Cabinet position

Rep. Alexandria Ocasio-Cortez (D-N.Y.) said on CNN's "State of the Union" Sunday that she believes it's "extremely important" that Joe Biden offer Sen. Bernie Sanders and other progressive leaders Cabinet positions if he's elected president.

The big picture: Ocasio-Cortez was pressed repeatedly on policy differences between her and the more moderate Biden, including her opposition to fracking and support for Medicare for All. She responded that it would be a "privilege" and a "luxury" to be able to lobby a Biden administration on progressive issues, insisting that the focus right now should be on winning the White House.