The increase to $25 million reflects "the gravity of his crimes and the continued threat he poses," a senior official said.
Venezuela opposition leader Maria Corina Machado was briefly arrested after appearing in public for the first time in months.
The United States will also extend temporary protections for roughly 600,000 Venezuelan migrants in the United States.
President-elect Donald Trump says Venezuela's embattled opposition leader must be protected as President Nicolas Maduro takes ...
US announces $25m reward for the arrest or conviction of Nicolas Maduro on the day he is sworn in as president of Venezuela ...
Venezuelan President Nicolás Maduro was sworn in Friday for a new term, extending his increasingly repressive rule in the ...