of the moment
Of importance at this time, as in The issue of the moment is dealing with our budget deficit. This expression gave rise in succeeding decades to the man of the moment, meaning "the most important person at this time," as in When Alan hit a home run and broke the tie, he was the man of the moment. [c. 1930]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.