5 February 2020

U.S. Security Policy in the Trump Era Has Been Marked by Change—and Continuity


When President Donald Trump entered office under an “America First” banner, it seemed to herald a new era of U.S. isolationism. After almost more than three years into his term, though, the shifts in America’s military engagements have been less dramatic. Though their numbers are down, U.S. troops are still stationed in Afghanistan. And until recently, the Trump administration had left unchanged the strategy against the Islamic State that it inherited from its predecessor.

Nevertheless, Trump’s isolationist instincts have come into regular tension with his closest advisers, many of whom espouse a more traditional view of American power projection. This was never clearer than in December 2018, when Trump ignored his aides and announced his decision to pull all U.S. troops out of Syria, prompting then-Defense Secretary Jim Mattis and other high-ranking officials to resign in protest. Trump subsequently softened his rhetoric, without definitively articulating a final policy, contributing to the sense of uncertainty over America’s security policymaking. The entire process was repeated in October, only this time the decision triggered not resignations, but outrage among even Trump’s closest Republican supporters in Congress.

Meanwhile, Trump’s vision has not stopped his advisers from hinting at military intervention as a path to regime change in places like Venezuela and Iran. In the latter case, Trump subsequently made his opposition to war clear. Trump’s reluctance to commit U.S. forces to another major conflict in the Middle East played a part in the deescalation of tensions with Tehran in January, following the U.S. killing of a top Iranian military commander, Maj. Gen. Qassem Soleimani, and Iran’s retaliatory ballistic missile strike against U.S. forces stationed in Iraq.

For now, however, Trump’s America First agenda has actually taken its heaviest toll on long-standing alliances. While he has taken credit for moderate increases in European defense spending, his vocal criticisms of NATO have weakened the alliance’s cohesion. And his demands for increased burden-sharing by South Korea and Japan for U.S. forces based in those countries has strained relations with both Seoul and Tokyo.

There have also been some shifts. The administration has positioned economic security as central to national security and justified its increasing use of tariffs on those grounds. Immigration, particularly along the border with Mexico, has also become a key focus of the security agenda. But Washington has pulled back from counterinsurgency efforts, even as the Islamic State regroups as a terrorist movement and, more broadly, America’s technological advantage over potential insurgent groups shrinks.

WPR has covered the U.S. military and its security strategy in detail and continues to examine key questions about what will happen next. Did Trump’s decision to kill Soleimani reestablish deterrence against Iran? Will the shift away from counterinsurgency allow ISIS to reemerge as an insurgency? And will Trump’s failure to fully enact his isolationist agenda affect his 2020 reelection bid? Below are some of the highlights of WPR’s coverage.

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