Jackson filed his paperwork Monday afternoon at the Republican Party of Texas' headquarters in Austin, the group's communications director, Sam Pohl, confirmed to CNN.The move comes following Jackson's retirement from the Navy last week as the Defense Department's Inspector General continues to investigate allegations that he was periodically intoxicated and mishandled prescription drugs. Jackson withdrew from consideration to lead the Department of Veterans Affairs in light of similar allegations last year.Dwrena Allen, spokeswoman for the inspector general, confirmed to CNN on Monday that the Pentagon inspector general's investigation into Jackson remains ongoing. CNN has reached out to Jackson for comment.A Texas native, Jackson is running as a Republican in the 13th District, which opened after longtime GOP incumbent Rep. Mac Thornberry announced his retirement in September. Trump won the district by 63 points in 2016.Jackson will face a crowded primary, as 13 other candidates are running for the Republican nomination, Pohl told CNN. Monday is the last day to file for candidacy to appear on the primary ballot in Texas, according to the Texas secretary of state's office.Trump re-nominated Jackson to receive a secRead More – Source