U.S President Trump set to lay out a new National Security Strategy

U.S President Donald J Trump. [Photo: Courtesy]

President Donald Trump is set to lay out a new National Security Strategy on Monday, built upon his trademark "America First" slogan, which is expected to have economic security at its core.

The US leader, who has dismantled the legacy of Barack Obama on issues ranging from climate change to free trade, and isolated Washington on the world stage, will unveil what is being billed as a comprehensive vision for tackling America's complex security challenges.