Definition: 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].
Input: Washington (CNN) A major outside group intended to serve as the political muscle behind Donald Trump's nascent presidency is sputtering and potentially splintering as tension tears the nonprofit further from its biggest donor, multiple sources close to the group told CNN. America First Policies, a group set up this winter to advocate for the Trump agenda, is treading water at best at a time when other, rival groups are staffing up and pushing them toward the sidelines. If the nonprofit does not regain its footing, several Trump allies fear that it could find itself out-punched politically as several looming policy battles invite a raft of spending from Democratic interest groups.One group source conceded that "it has been slow"Part of the dispute centers on whether the Mercers will have a seat on the nonprofit's board of directors 
 Question:The _ were initially expected to provide much of the funding for the group.

Mercers