Vincent Gray (left) leaves the White House after meeting with Obama and Holder. (David Nakamura/The Washington Post)

Vincent C. Gray was among 18 U.S. mayors who met with President  Obama and Attorney General Eric H. Holder in a private White House session today.

The topic du jour, according to a White House release, was “strategies to reduce youth violence.” In the meeting, the release said, Obama “applauded the mayors for their local efforts to combat violence, solicited their input about proven methods, and pledged his Administration’s partnership.”

Besides Gray, other mayors in attendance included Philadelphia’s Michael Nutter, Baltimore’s Stephanie Rawlings-Blake, Houston’s Annise Parker and Newark’s Cory Booker.

Today’s meeting was Gray’s first private encounter with Obama since a December 2010 one-on-one lunch, mayoral spokesman Pedro Ribeiro confirmed — and the first since Hizzoner’s 2010 campaign came under the scrutiny of federal investigators.

Four people involved in Gray’s campaign and/or an unreported “shadow” effort on his behalf have since pleaded guilty to felonies prosecuted by Holder’s Justice Department.

The meeting also comes a day before the 50th anniversary of the March on Washington, where Gray is scheduled to give brief introductory remarks during a program that will culminate in an address from the president.