US President Donald Trump will visit Israel and Egypt this week to oversee the initial implementation of his Gaza peace agreement, which many hope will permanently end the two-year war in the strip.

Should the peace hold, the Gaza accord will be Trump’s greatest foreign policy achievement, even surpassing the Abraham Accords of his first term that normalised relations between Israel and several Arab countries.

Given the speed with which the Trump administration has helped to negotiate the ceasefire, it is an opportune moment to assess Trump’s frenetic foreign policy at the start of his second presidential term.

The “Trump Doctrine” – the unconventional, high-energy and fast-moving approach to world affairs now pursued by the United States – has had some significant achievements, most notably in Gaza. But are these breakthroughs sustainable, and can his foreign policy approach be effective with larger geostrategic challenges?

One way the Trump administration’s approach is different from previous administrations – including Trump 1.0 – is in his leaner organisation, which is more capable of implementing quick action.

Trump has revamped the national security decision-making structure in surprising ways. His secretary of state, Marco Rubio, now serves concurrently as his national security adviser. Rubio has also reduced the staff of the National Security Council from around 350 to about 150, which is still larger than many of Trump’s predecessors before Barack Obama.

There have been some missteps. Trump’s first national security adviser,........

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