Why is US President Trump threatening Venezuela's President Maduro?

We look at what is behind the deployment of a large US military force to within striking distance of Venezuela.

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The Trump administration has doubled the reward for information leading to Maduro's capture, and its warships are within striking distance of Venezuela. Dozens of people have been killed in attacks on boats alleged to have been transporting drugs from the South American country.

Trump reportedly also gave Maduro an ultimatum to leave Venezuela, in a phone call the two men had on 21 November.

Nicolás Maduro rose to prominence under the leadership of left-wing President Hugo Chávez and his United Socialist Party of Venezuela (PSUV).

Maduro, a former bus driver and union leader, succeeded Chávez and has been president since 2013.