"We're going to get to the tax returns later," Bash said. "But just to put a button on this, you're running now for the Democratic nomination, and it is your Democratic opponent and many Democratic voters who want to see those transcripts."
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More context is needed, without further context, I'm guessing that "put a button on this" might be short for "button your lip with respect to this," that is, "keep quiet with respect to this."
Jose MourinhoBut just to put a button on this,
~ just to top it all off
~ just to mention one final piece of good news
~ just to add one nice flourish to my message
CJ