From America's southern border to the Panama Canal - from the UN's health agency to electric car makers - welcome to the new age of uncertainty.
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President Trump is due to meet top Republican leaders today to set out his main priorities - but his first full day in office has already been an indication of things to come.
In his first 24 hours, Donald Trump has put his name to a litany of executive orders - those are instructions from the president to government agencies.
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