President Donald Trump promised to make America great again — and part of that means making our country safe again by changing our foreign policy to better represent America's interest.

Monday, he's officially putting that plan on paper.

Prioritizing national security over a policy of "policing the world", Trump is poised to outline a new national security strategy that reverses Obama-era hand wringing and de-emphasizes multinational agreements that have dominated the United States' foreign policy since the end of the Cold War.

The Republican president, who ran on a platform of "America First," will detail his plan Monday. It will sharply alter the United States' relationships with the rest of the world.

The plan, according to senior administration officials who offered a preview Sunday, is to focus on four main themes: protecting the homeland and way of life; promoting American prosperity; demonstrating peace through strength; and advancing American influence in an ever-competitive world.

Trump's doctrine holds that nation states are in perpetual competition and that the U.S. must fight on all fronts to protect and defend its sovereignty from friend and foe alike.

The administration says that "America First" does not mean "America Alone," but the national security strategy to be presented by Trump will make clear that the United States will stand up for itself even if that means acting unilaterally on issues like trade, climate change and immigration, according to people familiar with the strategy.

The last such strategy document, prepared by then-President Barack Obama in 2015, declared climate change an "urgent and growing threat to our national security." A senior official said the Trump plan removes that determination — following the administration's threat to pull out of the Paris climate accord — but will mention the importance of environmental stewardship.

Despite the boldness of Trump's strategy, its fundamentals are not a surprise. The new policy emphasizes that U.S. economic security is national security and that economic security must be ensured with military might. And the U.S. is interested only in relationships with other countries, including alliances like NATO, that are fair and reciprocal.