The search at Trump's Mar-a-Lago estate was a month ago. What we've learned since.

One month after federal agents descended on Donald Trump’s Mar-a-Lago estate in Palm Beach, Florida, an unprecedented search of a former president's home, there have been a series of key revelations amid an intensifying court battle. 

• Court documents released since the Aug. 8 search showed the former president had classified documents marked "secret" and "top secret" at his estate. 
• Arguing before a judge, the Department of Justice suggested there were efforts to conceal and possibly obstruct their investigation.
• A federal judge granted Trump's request for a special master to conduct an independent third party to review of the documents seized by the FBI, a win for Trump that the Justice Department said could impede the probe. 

Here's more of what we have learned since the search and other key developments related to the Justice Department's ongoing investigation.