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US President Donald Trump has replaced Homeland Security Secretary Kristi Noem with Oklahoma Senator Markwayne Mullen amid mounting political pressure. Noem's tenure faced scrutiny over immigration enforcement controversies, a $220 million border security advertising campaign, and spending on private jet travel. Lawmakers criticized the campaign's contract awards, which favored associates of Noem and the Republican Party, while investigations into potential perjury during her congressional testimony have intensified. The move reflects broader challenges in Trump's administration, including the 'Do What's Right for America' (DOGE) initiative's focus on cost-cutting, which has been undermined by these expenditures. This leadership change could impact market sentiment by signaling political instability and policy uncertainty. Investors may worry about delayed immigration reforms and potential legal risks for high-profile officials. The replacement also raises questions about transparency in government contracts and oversight mechanisms, which could affect investor confidence in US fiscal management. Traders should monitor related political developments and any legal actions against Noem, as these could influence market volatility. For global markets, the shift highlights the fragility of Trump-era policies and their economic implications. If Noem faces legal consequences, Trump's potential pardon power could further complicate market perceptions of accountability. Investors should watch for congressional investigations into the campaign's spending and their impact on bipartisan relations. The situation underscores the need for caution in assets sensitive to US political shifts, such as the USD and Treasury yields.