Mark McCloskey, a St. Louis personal injury lawyer who gained national attention after he and his wife waved guns at racial injustice protesters who marched near their home last summer, is apparently on the verge of a 2022 U.S. Senate run.

McCloskey posted on Twitter that a “huge announcement” will be made Tuesday night on Tucker Carlson's Fox News program. McCloskey's spokesman, Billy Grant, declined to say if McCloskey planned a Senate run but said an announcement would be made Tuesday night.

Meanwhile, the Federal Election Commission's website shows “Mark McCloskey for Missouri” was registered Tuesday, and a website, mccloskeyforsenate.com, was seeking campaign donations. McCloskey previously said he was considering a Senate bid.

FILE - In this June 28, 2020 file photo, armed homeowners Mark and Patricia McCloskey, standing in front their house confront protesters marching to St. Louis Mayor Lyda Krewson's house in the Central West End of St. Louis. The couple, who face charges are asking a judge to remand the case back to the grand jury for reconsideration. Attorney Joel Schwartz's motion cites a judge's decision in December to take the case away from St. Louis Circuit Attorney Kim Gardner and appoint a special prosecutor because Gardner made reference to the case in political fundraising emails. (Laurie SkrivanSt. Louis Post-Dispatch via AP, File)

FILE - In this June 28, 2020 file photo, armed homeowners Mark and Patricia McCloskey, standing in front their house confront protesters marching to St. Louis Mayor Lyda Krewson's house in the Central West End of St. Louis. The couple, who face charges are asking a judge to remand the case back to the grand jury for reconsideration. Attorney Joel Schwartz's motion cites a judge's decision in December to take the case away from St. Louis Circuit Attorney Kim Gardner and appoint a special prosecutor because Gardner made reference to the case in political fundraising emails. (Laurie SkrivanSt. Louis Post-Dispatch via AP, File)

Incumbent Missouri Republican Roy Blunt announced in March he would not seek a third term. GOP contenders already include former Gov. Eric Greitens, who resigned from office amid a sex scandal in 2018, and Missouri Attorney General Eric Schmitt.

Mark and Patricia McCloskey became celebrities in conservative circles — and were vilified among Democrats — after the incident on June 28 outside their lavish home in St. Louis' Central West End.

Demonstrators were marching to the home of then-Mayor Lyda Krewson amid nationwide protests after police killed George Floyd in Minneapolis. The protesters ventured onto a private street that includes the McCloskey mansion. The couple, both of them attorneys in their early 60s, said they felt threatened after protesters broke down an iron gate and ignored a “No Trespassing” sign. Protest leaders denied damaging the gate and said the march was peaceful.

Mark McCloskey came out of his home with an AR-15-style rifle and Patricia McCloskey emerged with a semiautomatic handgun. Cellphone video captured the confrontation.

St. Louis Circuit Attorney Kim Gardner, a Democrat, charged the couple with unlawful use of a weapon. A grand jury in October indicted them on the same charge and added an evidence tampering charge. The indictment states that a semiautomatic pistol was altered in a way that “obstructed the prosecution of Patricia McCloskey” on the weapons charge.

The couple contended the charges were politically motivated. They spoke via video at last year's Republican National Convention. Republican Missouri Gov. Mike Parson has said he will pardon the McCloskeys if they are convicted.

Their case is due to go to trial in November, but Gardner's office won't be prosecuting it. A judge sent the case to a special prosecutor because Gardner made reference to the case in fundraising emails during her successful bid for reelection in 2020.