Donald Trump is enjoying healthy polling in the US but a ‘big wildcard’ could prove to be a sting in the tail for the Republican candidate at November’s presidential election, a top pollster has suggested. Being found guilty of one of the many charges he is faced with would not be an issue among Trump’s core voters, Johnson said on GBN America. But the pollster believes his stance on women’s rights and abortion could yet prove pivotal, claiming Joe Biden’s campaign team is ramping up efforts to focus on the aforementioned issues. “I think abortion and women’s rights issues are the big wildcard…