article_snippet: fence on September 19 and racing across the north lawn.
article_snippet: Barack Obama that the atmosphere was collapsing.
article_snippet: The Obamas were . not in the White House when the incident occurred.
article_snippet: The security breach was among a series of embarrassments for .
article_snippet: The agency's director stepped down in October.
article_snippet: In the most recent incident, two senior agents are under .
article_snippet: investigation after driving a government car through an area at .
article_snippet: the White House where colleagues were investigating a suspicious .
article_snippet: Michael McCaul, chairman of the House of Representatives .
article_snippet: allegations added to incidents that had caused Americans to .