Sentence:  When people hear my American accent, they want to talk to me about Donald Trump. They want to ask me what happened, and why. But most of all, they ask me – with fear filling their voices – what they can do, as individuals, to <WSD>counteract</WSD> him, here, from the United Kingdom. 
Meaning of the word marked with <WSD> tags:  To deliberately act in opposition to, to thwart or frustrate