In March 2026, Markwayne Mullin, a senator from Oklahoma, was nominated to replace Kristi Noem as the secretary of the Department of Homeland Security (DHS). Ahead of his confirmation, significant concerns were raised regarding his stock portfolio, which includes investments valued at over $305,000 in companies linked to the department, prompting discussions about potential conflicts of interest. Ethics experts, including Richard Painter, a former chief ethics lawyer under George W. Bush, warned that Mullin should divest from these stocks to avoid perceptions of impropriety. Mullin has reportedly utilized an independent firm to manage his investments and stated his intention to comply with all ethics rules. However, the situation aligns with a broader debate over congressional stock trading, as bipartisan calls have emerged to impose restrictions on such practices among lawmakers due to fears of insider trading and self-serving decisions. The scrutiny increases as Mullin, also a member of various influential Senate committees, represents an industry heavily influenced by government contracts, raising the stakes for both his personal wealth and public trust in governance.