On January 7, 2026, President Donald Trump initiated a sweeping overhaul of the United States' global engagement, ordering the withdrawal of the nation from 66 international organizations. This decision, communicated via a presidential memorandum, affects 31 United Nations entities and 35 non-UN affiliated groups, including critical bodies focused on climate, health, and education. Among the prominent organizations from which the U.S. is withdrawing are the World Health Organization (WHO), the United Nations Educational, Scientific and Cultural Organization (UNESCO), the United Nations Framework Convention on Climate Change (UNFCCC), and the India-France-led International Solar Alliance (ISA). The Trump administration has justified these withdrawals under an "America First" framework, asserting that these organizations are either redundant, mismanaged, or actively work against U.S. national interests, security, economic prosperity, or sovereignty. This move builds on earlier actions by Trump, including previous withdrawals from the WHO and UNESCO during his first term, which were later reversed by President Joe Biden. Concurrently with these withdrawals, President Trump proposed a staggering $1.5 trillion defense budget for fiscal year 2027. This represents a substantial 66% increase over the current 2026 military budget of $901 billion. The proposal, announced on January 7, 2026, has ignited debates about a shift towards a "Fortress America" doctrine, prioritizing domestic strength and protectionism over traditional global engagement. Critics fear that this policy fosters adversity and undermines multilateralism, while supporters applaud it as a necessary correction to decades of perceived overcommitment and a redirection of resources domestically. The impact on global governance and international cooperation is expected to be significant, with implications for climate policy, public health, and diplomatic relations worldwide.