Never-Trump Sen. Ben Sasse (R-NE) threatened to quit the National Republican Senatorial Committee (NRSC) on Wednesday if the NRSC decides to back Judge Roy Moore.

The Republican National Committee (RNC) decided to back Roy Moore on Monday after president Donald Trump offered his endorsement of the Alabama Judge. Sasse started a Twitter tirade on Wednesday, pledging to quit the NRSC should they also back the Alabama Senate Republican candidate.

Sasse tweeted, “This is a bad decision and very sad day. I believe the women–and RNC previously did too. What’s changed? Or is the party just indifferent?”

Sasse then said, “A political party must be about more than expediency. To have any future, a party must have some fundamental convictions and commitments.”

“If the political committee that I’m a part of (the NRSC) decides to contribute here, I will no longer be a donor to or fund-raiser for it,” Sen. Sasse whined.

If the political committee that I'm a part of (the NRSC) decides to contribute here, I will no longer be a donor to or fund-raiser for it. https://t.co/uN8nsPfCBU — Ben Sasse (@BenSasse) December 6, 2017

Failed presidential candidate Mitt Romney lashed out against Roy Moore after the president backed the Alabama judge.

Romney tweeted on Monday, “Roy Moore in the US Senate would be a stain on the GOP and on the nation. Leigh Corfman and other victims are courageous heroes. No vote, no majority is worth losing our honor, our integrity.”

Sen. Jeff Flake (R-AZ) chose to fund the campaign of Roy Moore’s competitor, Democrat Doug Jones.

“Country over party,” Flake wrote in a tweet, which included a picture of a $100 check made out to Doug Jones’ campaign in Alabama.

Country over Party pic.twitter.com/JZMTaEYdxQ — Jeff Flake (@JeffFlake) December 5, 2017

Conservatives and populists have argued since Ben Sasse’s 2014 Senate campaign that the former Midland University president does not hold conservative values. FreedomWorks criticized Sasse for previously supporting the Medicare Part D prescription drug program.

In 2014, Nebraska conservatives penned a letter in which they declared their support for Shane Osborn and argued that Republicans should not back Midland University President Ben Sasse. Conservative icon Phyllis Schlafly supported Osborn instead.

The Nebraska conservative coalition wrote in 2014, “Our philosophies and interests slightly differ in some ways, but on this we can all agree: Ben Sasse for US Senate is NOT the choice of conservative, libertarian, and tea party movement activists and group leaders in Nebraska.”