Former White House chief strategist Steve Bannon mocked Sen. Jeff Flake, R-Ariz., for writing a $100 check on Tuesday to support Democrat Doug Jones in the special election contest to fill Alabama's empty U.S. Senate seat.

“Come on brother, if you’re going to write a check, write a check,” Bannon said at a rally for the Republican candidate, Roy Moore. “Support somebody.”

“Man, you are a total embarrassment,” he added.

Bannon went on to say Flake hasn’t been on board with Trump’s agenda from the beginning.

“Jeff Flake has done nothing but run the president of the United States down since the president won,” Bannon said. “And then he comes out at the last second and says ‘I’m going to give $100 to a Democrat.’”

Flake posted a picture to Twitter on Tuesday of a check made out to Jones’ Senate campaign with the memo “country over party.”

Flake received backlash for the photo, including from Sen. Ben Sasse, as some Republicans interpreted it as Flake endorsing Jones’ position on abortion.

Moore has seen his polling numbers recover in recent weeks after being accused by multiple women of sexual misconduct.

The Washington Post reported the initial accusations against Moore last month. In that report, four women, accused Moore of pursuing sexual and romantic relations with them when they were between the ages of 14 and 18, while he was in his 30s. Other women have come forward with additional allegations since then.

Moore has repeatedly denied the allegations and has resisted pressure from top Republicans, including Senate Majority Leader Mitch McConnell, to drop out of the race.

Bannon's former boss, President Trump, offered Moore a critical endorsement this week, with the special election set to happen next week.