Q: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Washington (CNN) Donald Trump's tax controversy and his self-destructive lack of discipline threaten to drain the Republican nominee of something he can't afford: time. With 36 days remaining before Election Day, the real estate mogul's campaign is consumed with the fallout from a New York Times story published over the weekend that found Trump reported a $916 million loss in 1995. That loss could mean Trump went 18 years without paying federal income taxes. Those findings -- which Trump's campaign isn't disputing but haven't been independently confirmed by CNN -- would be daunting for any presidential candidate to overcome. But they're especially challenging for Trump, who is losing control of the campaign's narrative after a strong September in which he narrowed the race with Hillary Clinton.Trump is losing control of the campaign's narrative after a strong SeptemberTime is dwindling for Trump to regain his grip on the campaign's message 
 Question:The GOP nominee's closest surrogates launched a fierce defense of _ Sunday, portraying him as a master of business who expertly used the tax code to his benefit -- and that of his investors.
A:
Donald Trump