The President associated with the "Trust Busting" movement is Theodore Roosevelt.

Serving from 1901 to 1909, Roosevelt was a progressive reformer who sought to combat the power of large corporations and monopolies, which he viewed as harmful to the public interest. He famously utilized the Sherman Antitrust Act to take legal action against major trusts, including the Northern Securities Company. Roosevelt's administration aggressively pursued antitrust lawsuits, earning him a reputation as a "trust buster." His efforts laid the groundwork for future regulatory reforms and reinforced the government's role in regulating the economy.