DORAL, Fla. — Ronald Bellorin decided to flee Venezuela for the United States during President Donald Trump’s first administration, convinced the Republican leader would protect people like him who had been targeted by an autocratic regime. Now the university professor is worried the Trump administration is going to deport him. The Department of Homeland Security has canceled the temporary protected status given to thousands of Venezuelans who have arrived in recent years. Bellorin’s permission to work in the United States is set to expire in April, and his shield from deportation in September.