Trump strongly rejects international cooperation. Round 2 is underway.
Here's a timeline of Trump's actions involving international organizations and treaties, from his first term to the present.
Universal Postal Union (UPU)
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UPU closes fourth 'Extraordinary Congress' in Riyadh on digital future
The talks centered on climate, financial services and more cooperation among governments and private partners.
Biden U.N. pick signals U.S. return to alliances
U.S. President-elect Joe Biden’s selection of Linda Thomas-Greenfield to serve as ambassador to the U.N. signals America's pivot back to multilateralism.
Urgent UPU session reaches deal to keep U.S. in U.N. postal agency
UPU Congress' consensus vote to adopt the compromise plan represented "an historical moment," the agency's chief says.
UPU delegates reject Trump mail demand
The U.N. postal agency opened its Extraordinary Congress with a vote to reject the Trump administration's demand that it overhaul international delivery rates.
UPU drama over Trump challenge affects U.S. voting and opioids
Delegates will consider what to do in the face of the announcement last year by U.S. President Donald Trump’s administration to withdraw his nation's participation.
U.S. military officials are bracing for withdrawal from U.N. postal agency
The military delivered more than 88,000 tons of packages and letters last year and must now plan for a possible disruption.
Postal union scrambles to address U.S. criticism on mail delivery rates
The action came days after the Trump administration said it intends to withdraw from the 144-year-old organization.
Under pressure, global postal system grapples with tech and costs
For only a second time in its 144-year history, the Swiss-based Universal Postal Union held an "Extraordinary Congress," this time under U.S. pressure to change international postal rates.
'Low profile' multilateralism: North Korea's hidden avenues to the world
A summit with the U.S. could expand North Korea's little-known involvement with international organizations.
International cooperation is shaped by a history of waterways and wars
The first international organization dates to an 1804 Rhine River treaty. In the 20th century, organizations proliferated.