The state of play: In addition to his filing with the Federal Election Commission, McCloskey also launched a campaign website accepting donations for his bid.
"Mark is a Conservative outsider who will bring backbone and guts to the US Senate to continue fighting for President Trump's agenda," his website states.
What he's saying: "When the angry mob came to destroy my house and kill my family, I took a stand against them," McCloskey told the camera in a campaign announcement video aired during an interview with Tucker Carlson on "Tucker Carlson Tonight" Tuesday.
"I have always been a Republican but never been a politician. God came knocking on my door disguised as an angry mob. It woke me up," McCloskey told Carlson.
He went on to criticize the Biden administration for what he said was "a wholesale slaughter of our civil liberties" while bemoaning "cancel culture," among other complaints.
Flashback: Mark and Patricia McCloskey, both personal injury attorneys, were indicted in October on charges of unlawful use of a weapon and tampering with evidence after they pointed guns at anti-racism protestors from the lawn of the St. Louis mansion last July.
Their actions made them popular in some conservative circles and were subsequently invited to speak at the Republican National Convention in August.